Pathogens in Africanized Honeybees from Brazil (original) (raw)
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Virus infections in Brazilian honey bees
Journal of Invertebrate Pathology, 2008
This work describes the first molecular-genetic evidence for viruses in Brazilian honey bee samples. Three different bee viruses, Acute bee paralysis virus (ABPV), Black queen cell virus (BQCV), and Deformed wing virus (DWV) were identified during a screening of RNAs from 1920 individual adult bees collected in a region of southeastern Brazil that has recently shown unusual bee declines. ABPV was detected in 27.1% of colony samples, while BQCV and DWV were found in 37% and 20.3%, respectively. These levels are substantially lower than the frequencies found for these viruses in surveys from other parts of the world. We also developed and validated a multiplex RT-PCR assay for the simultaneous detection of ABPV, BQCV, and DWV in Brazil.
First metagenomic analysis of microorganisms in honey bees from Brazil
Alternative approaches including metagenomic and genetic screening can be extremely useful and can accelerate important discoveries related to a current phenomenon wich affect honey bees around the world (characterized by the depopulation or sudden losses of hives). To determine possible causes for the decline in honey bee colonies from southeastern Brazil, and in particular to test the likelihoods of specific predicted causative agent(s) for this condition, a diverse set of analyses were proposed. These analyses form part of a more extensive Epidemiological Evaluation Program for bees in southeastern Brazil. Here we present an overview about part of this Program. Three viruses were identified (Acute Bee Paralysis Virus-ABPV, Black Queen Cell Virus-BQCV, and Deformed Wing Virus-DWV) in 1,920 analyzed bees, and a multiplex RT-PCR assay was developed and validated. Although strategy adopted to analyze data in details is still being evaluated and prepared by the authors, the first results indicated that ca. 26 % of the samples carried Israeli Acute Paralysis Virus (IAPV), and some isolates for this virus were found. Nosema ceranae, Melissococus pluton, Leptomonas apis, and Spiroplasma apis were also detected. Pathological, epidemiological, and widespread studies remain to be conducted once no single pathogen seems overly predominant in declining bee colonies.
Black queen cell virus and Nosema ceranae coinfection in Africanized honey bees from southern Brazil
Pesquisa Veterinária Brasileira
ABSTRACT: Bees are fundamental in several aspects, especially in relation to plant biodiversity and pollination. Recently, immense losses are being faced in the number of Brazilian colonies, mainly in southern states of the country, which has a strong beekeeping activity. There are indications that, among the reasons for the losses, pathogens that affect the health of bees may be involved. Among them, the microsporidium Nosema and the black queen cell virus (BQCV) stand out for their prevalence. In this study, 92 colonies of 17 apiaries from southern Brazil were evaluated for infection by Nosema ceranae, Nosema apis and BQCV. Nucleic acid extractions and cDNA synthesis were performed from adult bee samples, followed by Reverse Transcription Polymerase Chain Reaction (RT-PCR) and multiplex PCR. Eight BQCV positive samples were subjected to sequencing. The results showed that N. ceranae and BQCV are circulating in the Southern region of the country, which may be the reason for the los...
Apidologie, 2013
Nosema ceranae is one of the causative agents of Nosemosis, a severe disease that affects the honeybee Apis mellifera. The aim of the present work was to compare N. ceranae and RNA virus infections in Africanized bees (hybrid of Apis mellifera scutellata and A. m. mellifera) and European (Italian) bees (A. m. ligustica) under field conditions. Africanized and Italian healthy colonies were relocated to an Eucalyptus grandis plantation, a place where colonies inevitably acquire Nosemosis. Fifteen and 30 days after that, all colonies presented N. ceranae spores although Africanized bees were less infected than Italian bees. Sacbrood virus (SBV) and Black queen cell virus (BQCV) were detected in both races of bees, although Africanized bees presented a lower level of BQCV infection than Italian bees. At the end of the flowering period, Africanized colonies had a larger honeybee population and produced more honey than Italian colonies. These results suggest that Africanized bees may be able to limit N. ceranae and BQCV infections within the colony, and that this may allow them to be more productive.
Journal of Invertebrate Pathology, 2013
Until the mid-1990s, the only microsporidium known to infect bees of the genus Apis was Nosema apis. A second species, Nosema ceranae, was first identified in 1996 from Asian honey bees; it is postulated that this parasite was transmitted from the Asian honey bee, Apis cerana, to the European honey bee, Apis mellifera. Currently, N. ceranae is found on all continents and has often been associated with honey bee colony collapse and other reports of high bee losses. Samples of Africanized drones collected in 1979, preserved in alcohol, were analyzed by light microscopy to count spores and were subjected to DNA extraction, after which duplex PCR was conducted. All molecular analyses (triplicate) indicated that the drones were infected with both N. ceranae and N. apis. PCR products were sequenced and matched to sequences reported in the GenBank (Acc. Nos. JQ639316.1 and JQ639301.1). The venation pattern of the wings of these males was compared to those of the current population living in the same area and with the pattern of drones collected in 1968 from Ribeirão Preto, SP, Brazil, from a location close to where African swarms first escaped in 1956. The morphometric results indicated that the population collected in 1979 was significantly different from the current living population, confirming its antiquity. Considering that the use of molecular tools for identifying Nosema species is relatively recent, it is possible that previous reports of infections (which used only light microscopy, without ultrastructural analysis) wrongly identified N. ceranae as N. apis. Although we can conclude that N. ceranae has been affecting Africanized honeybees in Brazil for at least 34 years, the impact of this pathogen remains unclear.
First report of viral infections that affect argentine honeybees
Environmental Microbiology Reports, 2010
Honey is one of the most important agricultural products for export in Argentina. In fact, more than 3.5 million beehives and 50 000 beekeepers are related with this production, mainly located in Buenos Aires province. Honeybee mortality is a serious problem that beekeepers in Argentina have had to face during the last 3 years. It is known that the consequence of the complex interactions between environmental and beekeeping parameters added to the effect of different disease agents such as viruses, bacteria, fungi and parasitic mites may result in a sudden collapse of the colony. In addition, multiple viral infections are frequently detected concomitantly in bee colonies. We describe here the preliminary results of a survey of three honeybee-pathogenic viruses, acute bee paralysis viruses (ABPV), chronic bee paralysis viruses (CBPV) and Sacbrood viruses (SBV) detected during a screening of 61 apiaries located in the main honey producer province using a RT-PCR assay. This is the first molecular report of the presence of these viruses in Argentine apiaries.
Preliminary studies on the occurrence of honeybee pathogens in the national bumblebee population
Annals of parasitology, 2018
Dangerous pathogens that affect honeybees, including microsporidia of the genus Nosema, the acute bee paralysis virus (ABPV) and the deformed wing virus (DWV), also contribute to the global decline in bumblebee populations. In this study, a few insects with the bumblebee population present in country was checked for the presence of Nosema apis, Nosema bombi and Nosema ceranae microsporidia, ABPV, the chronic bee paralysis virus (CBPV) and DWV. Thirteen adult bumblebees (Bombus) representing 4 species were analyzed: Bombus lapidarius (2 workers, 2 males), Bombus lucorum (1 worker), Bombus pascuorum (5 workers, 1 male) and Bombus terrestris (2 workers). These specimens were found dead in two urban botanical gardens and four landscape parks in Lower Silesia. Microsporidia of the genus Nosema and CBPV were not detected in any of the examined samples. ABPV was identified in 2 insects of B. pascuorum and B. terrestris (2 workers). The presence of DWV was detected in 12 bumblebees (10 work...