Prevalence, incidence, risk factors and residual risk associated with viral infections among eligible Brazilian blood donors.

Knowledge regarding the profile of eligible blood donors presenting positive results in laboratory screening is essential for reducing transfusion-transmitted human immunodeficiency virus (HIV), hepatitis B virus (HBV) and hepatitis C virus (HCV). Our study aimed to evaluate the prevalence, incidence, predictor variables and residual risk (RR) of HIV/HBV/HCV in blood bags donated in Minas Gerais, Brazil. This study analysed data retrieved from the records of a large blood bank relating to donations collected at multiple centres within the period 2012-2018, during which 1 991 120 blood bags were screened using immunoassays and nucleic acid tests (NATs). Multilevel modelling was used to investigate the association between sex, civil status and age group with HIV/HBV/HCV. RR was estimated from the incidence values (restricted to negative and positive tests within the study period) and window periods for infections. The prevalence in first time donors, incidence and RR of HCV (223.73 cases per 100 000; 54.84 per 100 000 persons-year and 1.6527 per 100 000, respectively) were higher than those of HIV (172.65 cases per 100 000; 28.25 per 100 000 persons-year and 0.8514 per 100 000) and HBV (168.17 cases per 100 000; 18.54 per 100 000 persons-year and 0.5588 per 100 000). The odds of acquiring infection were greater in male, single and older donors. Sixteen donors were identified as seronegative and NATs+ during the 7-year span of the study. Our study has clarified some spatiotemporal trends regarding HIV/HBV/HCV infections in donated blood in Brazil. The results will contribute to the formulation of directives addressed to high-risk donors.

Responsible companion animal guardianship is associated with canine visceral leishmaniasis: an analytical cross-sectional survey in an urban area of southeastern Brazil.

BACKGROUND: Responsible companion animal guardianship (RCAG) comprises a set of concepts involving activities, behavior and care that guardians must provide to ensure the welfare of their animals. When such principles are disregarded, the risk of animals developing zoonotic diseases, such as canine visceral leishmaniasis (CVL), increases. This disease is a public health problem in many urban settings in Brazil because dogs are the main reservoirs of Leishmania and are involved in the transmission of the parasites to humans. Our analytical cross-sectional epidemiological survey aimed to investigate the prevalence of CVL in a city in southeastern Brazil and to establish the association between the disease and a number of predictor variables including dog traits, socioeconomic status of guardians, ecological features of the domicile and RCAG. RESULTS: Our study showed that the global prevalence of CVL in the sample canine population was 6.7% (47/704). All variables related to better dog care were associated with lower chances of infection. Multiple regression analysis revealed that the chances of animals being seropositive for CVL were significantly (p < 0.05) higher when guardians had no formal education or possessed a university degree (vs. those with complete primary or secondary schooling) and when dogs were sheltered outside the house and had free access to the streets. An additional novel finding was that dogs that were acquired as puppies presented half of the chance of developing the disease in comparison with those acquired at the adult stage. Geographically weighted logistic regression coefficients showed that the strengths of the predictor/CVL associations varied depending on the studied geographical space. Both models demonstrated that the associations were always in the same directions. CONCLUSIONS: Our findings indicate that regardless of age and mode of acquisition, adult dogs should be submitted to clinical evaluation and tests for CVL. RCAG can exert positive effects on the control of CVL.

The association between non-permanence of dogs in households and non-compliance with the principles of responsible animal guardianship: A survey in a medium-sized city in Brazil.

The permanence of a dog in a household is relevant in terms of public health and animal welfare because it implies that the animal is receiving better care and is unlikely to be abandoned. We have performed a survey in a medium-sized city in southeastern Brazil in order to identify predictors associated with the non-permanence of dogs in households as determined one year after the first visit. During the first of two visits to randomly selected domiciles, guardians were asked to complete a structured questionnaire regarding the traits and history of each dog in the household, features of the domicile, characteristics of the guardian and adherence to the principles of responsible companion animal guardianship (RCAG). A second visit to each domicile was performed one year later in order to establish in loco whether the dog still resided in the domicile and, where appropriate, to apply a further questionnaire concerning the fate of the missing animal. The total sample population comprised 513 dogs, of which 98 (19.1%) were verified as no longer resident in the domicile on the occasion of the second visit. Of the absent dogs, 59 had died as a result of fights with stray animals, traffic accidents, diseases or old age, 13 had been sent to alternative addresses, 8 had been donated to third parties and 7 had escaped from the domicile. The fates of the remaining 11 animals were not divulged by the guardians. Multiple regression analysis revealed that the risk of non-permanence was significantly higher (p < 0.05) among male dogs, those that were infested with ticks, had free access to the streets or resided in domiciles near a wooded area, but was significantly lower among wormed and neutered dogs. The adoption of RCAG principles is associated with the permanence of dogs in households and, consequently, in reduction of the stray population, animal well-being and prevention of zoonoses. On this basis, it is important to raise awareness about the concepts of RCAG and to strengthen accountability of guardians that do not take proper care of their animals.