Martin Yakum - Academia.edu (original) (raw)

Papers by Martin Yakum

Research paper thumbnail of The validity and reliability of parents recall for routine Immunization in Cameroon: an evaluative study

Introduction: Parent’s recall is one of the frequently used sources for information on children i... more Introduction: Parent’s recall is one of the frequently used sources for information on children immunization history. During the 2018 demograhpic and health survey in Cameroon, parent’s recall was the only source of information for 47% of chidren assessed for immunization coverage. The objective of this study was to determine the validity of parent’s recall for immunization compared with the vaccination card as the gold standard in Yaounde-Cameroon. Methods: A household-based survey was conducted targeting parents of children aged 0-59months who had their children’s vaccination cards. The immunization history of each child was taken based on both parent’s recall and vaccination card. Using the vaccination card as a gold standard, the sensitivity, specificity, positive predictive value and negative predictive value of parent’s recall were calculated with their corresponding 95% confidence interval (CI). The degree of agreement and the kappa statistics between the two methods were cal...

Research paper thumbnail of The burden of vaccine hesitancy for routine immunization in Yaounde-Cameroon: A cross-sectional study

PLOS Global Public Health

Immunization is the most cost-effective health intervention in the world yet, vaccination uptake ... more Immunization is the most cost-effective health intervention in the world yet, vaccination uptake is still low with less than 50% of children aged 12–23 months fully vaccinated in Cameroon by 2018. The objective of this study was to estimate the burden of vaccine hesitancy associated with routine vaccines in Yaounde-Cameroon. A two-stage cross-sectional cluster survey was conducted in Yaoundé in November 2021, targeting parents/guardians of children 0–59 months. Clusters were selected with probability proportionate to size (PPS) and household’s selection done using a restricted sampling method. Data collection was done using an interviewer-administered questionnaire, “Core Closed Questions” and “Likert Scale Questions” proposed by the WHO Vaccine Hesitancy Technical Working Group in 2014. Vaccine hesitancy was analyzed as proportions of parent’s/guardian’s self-reported vaccine refusal or delay in vaccination with 95% confidence interval. This was stratified by household wealth level...

Research paper thumbnail of Factors associated with abnormal temperature recording in vaccine’s cold chain: Case of north west region, Cameroon

Journal of Vaccines and Vaccination, Jan 13, 2016

Research paper thumbnail of Additional file 1 of An innovative approach in monitoring oral cholera vaccination campaign: integration of a between-round survey

Additional file 1. Questionnaire of the surveys conducted in the study "An innovative approa... more Additional file 1. Questionnaire of the surveys conducted in the study "An innovative approach in monitoring Oral Cholera Vaccination campaign: integration of a between-round survey".

Research paper thumbnail of An innovative approach in monitoring oral cholera vaccination campaign: integration of a between-round survey

<jats:title>Abstract</jats:title><jats:sec> <jats:title>Background</ja... more <jats:title>Abstract</jats:title><jats:sec> <jats:title>Background</jats:title> <jats:p>Monitoring and Evaluation (M&amp;E) is essential in ensuring population's access to immunization. Surveys are part of this M&amp;E approach but its timing limits the use of its results to improve the coverage of the evaluated campaign. An oral cholera vaccination campaign was organized in a health district of the Far North region of Cameroon and involved an innovative M&amp;E approach. The aim of this project was to assess the feasibility and effect of using recommendations of a community-based immunization and communication coverage survey conducted after the first round of an OCV campaign on the coverage of the second-round of the campaign.</jats:p> </jats:sec><jats:sec> <jats:title>Methods</jats:title> <jats:p>Two community-based surveys were included in the M&amp;E plan and conducted at the end of each of the campaign rounds. Data were collected by trained and closely supervised surveyors and reported using smartphones. Key results of the first-round survey were disseminated to campaign implementing team prior to the second round. The two rounds of the pre-emptive campaign were organized by the Cameroon Ministry of Public Health and partners with a two-week interval in the Mogode Health District of the Far North region of Cameroon in May and June 2017.</jats:p> </jats:sec><jats:sec> <jats:title>Results</jats:title> <jats:p>Of 120 targeted clusters, 119 (99.1%) and 117 (97.5%) were reached for the first and second rounds respectively. Among the Mogode population eligible for vaccination, the immunization coverage based on evidence (card or finger mark) were estimated at 81.0% in the first round and increased to 88.8% in the second round (X<jats:sup>2</jats:sup>=69.0 and p &lt;0.00). For the second round, we estimated 80.1% and 4.3% of persons who were administered 2 doses and 1 dose of OCV with evidence respectively, and 3.8% of persons who have not been vaccinated. The distribution of campaign communication coverage per health area was shared with the campaign coordination team for better planning of the second round campaign activities.</jats:p> </jats:sec><jats:sec> <jats:title>Conclusions</jats:title> <jats:p>It is feasible to plan and implement coverage survey after first round OCV campaign and use its results for the better planning of the second round. For the present study, this is associated to the improvement of OCV coverage in the second-round vaccination. If this is persistent in other contexts, it may apply to improve coverage of any health campaign that is organized in more than one round.</jats:p> </jats:sec>

Research paper thumbnail of Additional file 1: of Quantification and factors associated with HIV-related stigma among persons living with HIV/AIDS on antiretroviral therapy at the HIV-day care unit of the Bamenda Regional Hospital, North West Region of Cameroon

Questionnaire for the evaluation of HIV-related stigma among PLHIVA and associated factors. (DOCX... more Questionnaire for the evaluation of HIV-related stigma among PLHIVA and associated factors. (DOCX 32 kb)

Research paper thumbnail of The burden of vaccine hesitancy for routine immunization in Yaounde-Cameroon: restrictive sampling technique

Immunization is the most cost-effective health intervention in the world yet, vaccination uptake ... more Immunization is the most cost-effective health intervention in the world yet, vaccination uptake is still low with less than 50% of children aged 12-23 months fully vaccinated Cameroon. The objective of this study was to estimate the burden of vaccine hesitancy associated with routine EPI vaccines in Yaounde-Cameroon. A two-stage cross-sectional cluster survey was conducted in Yaoundé in May-June 2022, targeting parents/guardians of children 0-59 months. Clusters were selected with probability proportionate to size (PPS) and household’s selection done using a restricted sampling method. Data collection was done using an interviewer-administered questionnaire. Data were cleaned using MS-Excel 2019, and analyzed with R version 4.1.0 (2021-05-18). A total of 529 participants were enrolled out of 708 visited, giving a non-response rate of 25%. In total, vaccine hesitancy was reported in 137(25.90[22.35-29.80] %), and vaccine hesitancy prevalence did not vary significantly across differe...

Research paper thumbnail of Additional file 2 of Knowledge of peri-menarcheal changes and a comparative analysis of the age at menarche among young adolescent school girls in urban and rural Cameroon

Additional file 2: Supporting information file (S2). Database containing "status quo" d... more Additional file 2: Supporting information file (S2). Database containing "status quo" data on the age of menarche in rural and urban Cameroon.

Research paper thumbnail of Additional file 1 of Knowledge of peri-menarcheal changes and a comparative analysis of the age at menarche among young adolescent school girls in urban and rural Cameroon

Additional file 1: Supporting information file (S1). Questionnaire on menarche.

Research paper thumbnail of Additional file 1: of Map of biomedical research in Cameroon; a documentary review of approved protocols from 1997 to 2012

Research paper thumbnail of Additional file 1: of Biomedical research ethics in Cameroon: a survey to assess training needs of medical residents and students

Data collection tool (Questionnaire). (DOCX 20 kb)

Research paper thumbnail of Additional file 1: of Assessing the detection, reporting and investigation of adverse events in clinical trial protocols implemented in Cameroon: a documentary review of clinical trial protocols

Operational definitions used in the research. (DOCX 14 kb)

Research paper thumbnail of Additional file 2: of The expanded program on immunization service delivery in the Dschang health district, west region of Cameroon: a cross sectional survey

Health facility questionnaire. (PDF 380 kb)

Research paper thumbnail of Additional file 1: of The expanded program on immunization service delivery in the Dschang health district, west region of Cameroon: a cross sectional survey

Research paper thumbnail of Additional file 3: of The expanded program on immunization service delivery in the Dschang health district, west region of Cameroon: a cross sectional survey

Health personnel. (PDF 298 kb)

Research paper thumbnail of Additional file 1: of Contraceptive use and determinants of unmet need for family planning; a cross sectional survey in the North West Region, Cameroon

Questionnaire for the evaluation of contraceptive use, unmet need for family planning and its det... more Questionnaire for the evaluation of contraceptive use, unmet need for family planning and its determinants. (DOCX 146Â kb)

Research paper thumbnail of Additional file 1: of Health facility preparedness for cholera outbreak response in four cholera-prone districts in Cameroon: a cross sectional study

Questionnaire, this is the data collection tool that was used in the data collection for this stu... more Questionnaire, this is the data collection tool that was used in the data collection for this study. (DOCX 26 kb)

Research paper thumbnail of MOESM1 of Health seeking behaviour among suspected cases of cholera in Cameroonian health districts in Lake Chad basin

Additional file 1. Data tool, gives details of data collected for this study.

Research paper thumbnail of DOI 10.1186/s13104-015-1257-y RESEARCH ARTICLE Factors associated with the exposure

Background: Adverse temperature recording in vaccine’s cold chain is a major issue worldwide and ... more Background: Adverse temperature recording in vaccine’s cold chain is a major issue worldwide and this condition is known to compromise the quality of vaccines very rapidly. In Cameroon, with tropical climate, vaccines exposure to abnormal temperatures is very common. This study was conducted to identify factors associated to abnormal tem-perature recording in cold chain in the North West region. Results: A total of 65 vaccinating health facilities were visited for the study from eight health districts. Concerning type of health facility, 48 (73.8%) of the health facilities were governmental facilities. About 50 (76.0%) of the facilities had a functional thermometer. Among the 50 health facilities with functional thermometer, abnormal temperatures were registered in 10 (20%) health facilities during data collection and 12 (24%) in the 2 months preceding collection. Factor significantly associated with abnormal temperature recording was the absence of an alternative power source (OR =...

Research paper thumbnail of Hypocalcaemia and calcium intake in pregnancy: A research protocol for critical analysis of risk factors, maternofoetal outcomes and evaluation of diagnostic methods in a third-category health facility, Cameroon

PLOS ONE, 2020

Introduction Hypocalcaemia in pregnancy remains a major health issue, particularly in the develop... more Introduction Hypocalcaemia in pregnancy remains a major health issue, particularly in the developing world where daily calcium intakes are suboptimal. This electrolyte imbalance can lead to severe maternofoetal and childhood consequences. Calcium supplementation, amongst others, contributes significantly to meeting calcium demands in pregnancy. With ionised calcaemia as the gold standard for diagnosis, total calcaemia and albumin-corrected calcaemia in other pathological states have been found to overestimate the burden of hypocalcaemia. The main objectives of this study are to describe the blood calcium level (total, albumin corrected, and ionised calcaemia) and associated maternofoetal outcomes while identifying determinants of calcium supplementation and ionised hypocalcaemia. This study will also evaluate the sensitivity and specificity of albumin corrected calcaemia as a diagnostic tool for hypocalcaemia (ionised calcaemia as the gold standard) among pregnant women in the Nkong...

Research paper thumbnail of The validity and reliability of parents recall for routine Immunization in Cameroon: an evaluative study

Introduction: Parent’s recall is one of the frequently used sources for information on children i... more Introduction: Parent’s recall is one of the frequently used sources for information on children immunization history. During the 2018 demograhpic and health survey in Cameroon, parent’s recall was the only source of information for 47% of chidren assessed for immunization coverage. The objective of this study was to determine the validity of parent’s recall for immunization compared with the vaccination card as the gold standard in Yaounde-Cameroon. Methods: A household-based survey was conducted targeting parents of children aged 0-59months who had their children’s vaccination cards. The immunization history of each child was taken based on both parent’s recall and vaccination card. Using the vaccination card as a gold standard, the sensitivity, specificity, positive predictive value and negative predictive value of parent’s recall were calculated with their corresponding 95% confidence interval (CI). The degree of agreement and the kappa statistics between the two methods were cal...

Research paper thumbnail of The burden of vaccine hesitancy for routine immunization in Yaounde-Cameroon: A cross-sectional study

PLOS Global Public Health

Immunization is the most cost-effective health intervention in the world yet, vaccination uptake ... more Immunization is the most cost-effective health intervention in the world yet, vaccination uptake is still low with less than 50% of children aged 12–23 months fully vaccinated in Cameroon by 2018. The objective of this study was to estimate the burden of vaccine hesitancy associated with routine vaccines in Yaounde-Cameroon. A two-stage cross-sectional cluster survey was conducted in Yaoundé in November 2021, targeting parents/guardians of children 0–59 months. Clusters were selected with probability proportionate to size (PPS) and household’s selection done using a restricted sampling method. Data collection was done using an interviewer-administered questionnaire, “Core Closed Questions” and “Likert Scale Questions” proposed by the WHO Vaccine Hesitancy Technical Working Group in 2014. Vaccine hesitancy was analyzed as proportions of parent’s/guardian’s self-reported vaccine refusal or delay in vaccination with 95% confidence interval. This was stratified by household wealth level...

Research paper thumbnail of Factors associated with abnormal temperature recording in vaccine’s cold chain: Case of north west region, Cameroon

Journal of Vaccines and Vaccination, Jan 13, 2016

Research paper thumbnail of Additional file 1 of An innovative approach in monitoring oral cholera vaccination campaign: integration of a between-round survey

Additional file 1. Questionnaire of the surveys conducted in the study "An innovative approa... more Additional file 1. Questionnaire of the surveys conducted in the study "An innovative approach in monitoring Oral Cholera Vaccination campaign: integration of a between-round survey".

Research paper thumbnail of An innovative approach in monitoring oral cholera vaccination campaign: integration of a between-round survey

<jats:title>Abstract</jats:title><jats:sec> <jats:title>Background</ja... more <jats:title>Abstract</jats:title><jats:sec> <jats:title>Background</jats:title> <jats:p>Monitoring and Evaluation (M&amp;E) is essential in ensuring population's access to immunization. Surveys are part of this M&amp;E approach but its timing limits the use of its results to improve the coverage of the evaluated campaign. An oral cholera vaccination campaign was organized in a health district of the Far North region of Cameroon and involved an innovative M&amp;E approach. The aim of this project was to assess the feasibility and effect of using recommendations of a community-based immunization and communication coverage survey conducted after the first round of an OCV campaign on the coverage of the second-round of the campaign.</jats:p> </jats:sec><jats:sec> <jats:title>Methods</jats:title> <jats:p>Two community-based surveys were included in the M&amp;E plan and conducted at the end of each of the campaign rounds. Data were collected by trained and closely supervised surveyors and reported using smartphones. Key results of the first-round survey were disseminated to campaign implementing team prior to the second round. The two rounds of the pre-emptive campaign were organized by the Cameroon Ministry of Public Health and partners with a two-week interval in the Mogode Health District of the Far North region of Cameroon in May and June 2017.</jats:p> </jats:sec><jats:sec> <jats:title>Results</jats:title> <jats:p>Of 120 targeted clusters, 119 (99.1%) and 117 (97.5%) were reached for the first and second rounds respectively. Among the Mogode population eligible for vaccination, the immunization coverage based on evidence (card or finger mark) were estimated at 81.0% in the first round and increased to 88.8% in the second round (X<jats:sup>2</jats:sup>=69.0 and p &lt;0.00). For the second round, we estimated 80.1% and 4.3% of persons who were administered 2 doses and 1 dose of OCV with evidence respectively, and 3.8% of persons who have not been vaccinated. The distribution of campaign communication coverage per health area was shared with the campaign coordination team for better planning of the second round campaign activities.</jats:p> </jats:sec><jats:sec> <jats:title>Conclusions</jats:title> <jats:p>It is feasible to plan and implement coverage survey after first round OCV campaign and use its results for the better planning of the second round. For the present study, this is associated to the improvement of OCV coverage in the second-round vaccination. If this is persistent in other contexts, it may apply to improve coverage of any health campaign that is organized in more than one round.</jats:p> </jats:sec>

Research paper thumbnail of Additional file 1: of Quantification and factors associated with HIV-related stigma among persons living with HIV/AIDS on antiretroviral therapy at the HIV-day care unit of the Bamenda Regional Hospital, North West Region of Cameroon

Questionnaire for the evaluation of HIV-related stigma among PLHIVA and associated factors. (DOCX... more Questionnaire for the evaluation of HIV-related stigma among PLHIVA and associated factors. (DOCX 32 kb)

Research paper thumbnail of The burden of vaccine hesitancy for routine immunization in Yaounde-Cameroon: restrictive sampling technique

Immunization is the most cost-effective health intervention in the world yet, vaccination uptake ... more Immunization is the most cost-effective health intervention in the world yet, vaccination uptake is still low with less than 50% of children aged 12-23 months fully vaccinated Cameroon. The objective of this study was to estimate the burden of vaccine hesitancy associated with routine EPI vaccines in Yaounde-Cameroon. A two-stage cross-sectional cluster survey was conducted in Yaoundé in May-June 2022, targeting parents/guardians of children 0-59 months. Clusters were selected with probability proportionate to size (PPS) and household’s selection done using a restricted sampling method. Data collection was done using an interviewer-administered questionnaire. Data were cleaned using MS-Excel 2019, and analyzed with R version 4.1.0 (2021-05-18). A total of 529 participants were enrolled out of 708 visited, giving a non-response rate of 25%. In total, vaccine hesitancy was reported in 137(25.90[22.35-29.80] %), and vaccine hesitancy prevalence did not vary significantly across differe...

Research paper thumbnail of Additional file 2 of Knowledge of peri-menarcheal changes and a comparative analysis of the age at menarche among young adolescent school girls in urban and rural Cameroon

Additional file 2: Supporting information file (S2). Database containing "status quo" d... more Additional file 2: Supporting information file (S2). Database containing "status quo" data on the age of menarche in rural and urban Cameroon.

Research paper thumbnail of Additional file 1 of Knowledge of peri-menarcheal changes and a comparative analysis of the age at menarche among young adolescent school girls in urban and rural Cameroon

Additional file 1: Supporting information file (S1). Questionnaire on menarche.

Research paper thumbnail of Additional file 1: of Map of biomedical research in Cameroon; a documentary review of approved protocols from 1997 to 2012

Research paper thumbnail of Additional file 1: of Biomedical research ethics in Cameroon: a survey to assess training needs of medical residents and students

Data collection tool (Questionnaire). (DOCX 20 kb)

Research paper thumbnail of Additional file 1: of Assessing the detection, reporting and investigation of adverse events in clinical trial protocols implemented in Cameroon: a documentary review of clinical trial protocols

Operational definitions used in the research. (DOCX 14 kb)

Research paper thumbnail of Additional file 2: of The expanded program on immunization service delivery in the Dschang health district, west region of Cameroon: a cross sectional survey

Health facility questionnaire. (PDF 380 kb)

Research paper thumbnail of Additional file 1: of The expanded program on immunization service delivery in the Dschang health district, west region of Cameroon: a cross sectional survey

Research paper thumbnail of Additional file 3: of The expanded program on immunization service delivery in the Dschang health district, west region of Cameroon: a cross sectional survey

Health personnel. (PDF 298 kb)

Research paper thumbnail of Additional file 1: of Contraceptive use and determinants of unmet need for family planning; a cross sectional survey in the North West Region, Cameroon

Questionnaire for the evaluation of contraceptive use, unmet need for family planning and its det... more Questionnaire for the evaluation of contraceptive use, unmet need for family planning and its determinants. (DOCX 146Â kb)

Research paper thumbnail of Additional file 1: of Health facility preparedness for cholera outbreak response in four cholera-prone districts in Cameroon: a cross sectional study

Questionnaire, this is the data collection tool that was used in the data collection for this stu... more Questionnaire, this is the data collection tool that was used in the data collection for this study. (DOCX 26 kb)

Research paper thumbnail of MOESM1 of Health seeking behaviour among suspected cases of cholera in Cameroonian health districts in Lake Chad basin

Additional file 1. Data tool, gives details of data collected for this study.

Research paper thumbnail of DOI 10.1186/s13104-015-1257-y RESEARCH ARTICLE Factors associated with the exposure

Background: Adverse temperature recording in vaccine’s cold chain is a major issue worldwide and ... more Background: Adverse temperature recording in vaccine’s cold chain is a major issue worldwide and this condition is known to compromise the quality of vaccines very rapidly. In Cameroon, with tropical climate, vaccines exposure to abnormal temperatures is very common. This study was conducted to identify factors associated to abnormal tem-perature recording in cold chain in the North West region. Results: A total of 65 vaccinating health facilities were visited for the study from eight health districts. Concerning type of health facility, 48 (73.8%) of the health facilities were governmental facilities. About 50 (76.0%) of the facilities had a functional thermometer. Among the 50 health facilities with functional thermometer, abnormal temperatures were registered in 10 (20%) health facilities during data collection and 12 (24%) in the 2 months preceding collection. Factor significantly associated with abnormal temperature recording was the absence of an alternative power source (OR =...

Research paper thumbnail of Hypocalcaemia and calcium intake in pregnancy: A research protocol for critical analysis of risk factors, maternofoetal outcomes and evaluation of diagnostic methods in a third-category health facility, Cameroon

PLOS ONE, 2020

Introduction Hypocalcaemia in pregnancy remains a major health issue, particularly in the develop... more Introduction Hypocalcaemia in pregnancy remains a major health issue, particularly in the developing world where daily calcium intakes are suboptimal. This electrolyte imbalance can lead to severe maternofoetal and childhood consequences. Calcium supplementation, amongst others, contributes significantly to meeting calcium demands in pregnancy. With ionised calcaemia as the gold standard for diagnosis, total calcaemia and albumin-corrected calcaemia in other pathological states have been found to overestimate the burden of hypocalcaemia. The main objectives of this study are to describe the blood calcium level (total, albumin corrected, and ionised calcaemia) and associated maternofoetal outcomes while identifying determinants of calcium supplementation and ionised hypocalcaemia. This study will also evaluate the sensitivity and specificity of albumin corrected calcaemia as a diagnostic tool for hypocalcaemia (ionised calcaemia as the gold standard) among pregnant women in the Nkong...