Pyriproxyfen and the microcephaly epidemic in Brazil - an ecological approach to explore the hypothesis of their association.

The microcephaly epidemic in Brazil generated intense debate regarding its causality, and one hypothesised cause of this epidemic, now recognised as congenital Zika virus syndrome, was the treatment of drinking water tanks with pyriproxyfen to control Aedes aegypti larvae. We present the results of a geographical analysis of the association between the prevalence of microcephaly confirmed by Fenton growth charts and the type of larvicide used in the municipalities that were home to the mothers of the affected newborns in the metropolitan region of Recife in Pernambuco, the state in Brazil where the epidemic was first detected. The overall prevalence of microcephaly was 82 per 10,000 live births in the three municipalities that used the larvicide Bti (Bacillus thuringiensis israelensis) instead of pyriproxyfen, and 69 per 10,000 live births in the eleven municipalities that used pyriproxyfen. The difference was not statistically significant. Our results show that the prevalence of microcephaly was not higher in the areas in which pyriproxyfen was used. In this ecological approach, there was no evidence of a correlation between the use of pyriproxyfen in the municipalities and the microcephaly epidemic.

Radiographic features of pulmonary tuberculosis in patients infected by HIV: is there an objective indicator of co-infection?

This study aimed to compare the radiographic characteristics of patients with pulmonary tuberculosis (TB) and human immunodeficiency virus (HIV) infection with those of HIV-negative patients. In all, 275 TB patients attending the outpatients clinics at the University Hospital/UFPE, were studied from January 1997 to March 1999. Thirty nine (14.2%) of them were HIV(+), with a higher frequency of males in this group (p=0.044). Seventy-five percent of the HIV(+) patients and 19% of the HIV(-) had a negative tuberculin test (PPD) (p < 0.001). The proportion of positive sputum smears in the two groups was similar. The radiological finding most strongly associated with co-infection was absence of cavitation (p < 0.001). It may therefore be concluded that the lack of cavitation in patients with pulmonary TB may be considered a useful indicator of the need to investigate HIV infection. This approach could contribute to increasing the effectiveness of local health services, by offering appropriate treatment to co-infected patients.

Este trabalho objetivou comparar características radiológicas de doentes com tuberculose (TB) pulmonar, soropositivos para o vírus da imunodeficiência humana (HIV), com aquelas de doentes HIV-. Estudou-se, prospectivamente, 275 doentes com TB pulmonar, atendidos no Hospital das Clínicas da UFPE, entre janeiro de 1997 e março de 1999. Destes, 39 (14,2%) eram HIV+, com um predomínio maior de homens neste grupo (p=0,044). setenta e cinco por cento dos doentes HIV+ e 19% dos HIV- apresentavam reação negativa ao teste tuberculínico (PPD) (p<0,001). A proporção de baciloscopias positivas nos dois grupos foi semelhante. A característica radiológica mais fortemente associada à co-infecção tuberculose pulmonar/HIV+ foi a ausência de cavidades (p<0,001). Conclui-se que, diante de doentes com TB pulmonar, a ausência de cavidades na telerradiografia de tórax constitui-se num indicador útil da necessidade de se investigar a infecção pelo HIV. Esta conduta pode contribuir para aumentar a efetividade dos serviços locais de saúde, permitindo oferecer tratamento adequado a estes doentes.

Avaliação de indicador sócio-ambiental utilizado no rastreamento de áreas de tansmissão de filariose linfática em espaços urbanos

O artigo narra um estudo realizado no Município de Olinda, Pernambuco, em áreas com diferentes riscos de transmissão da filariose bancroftiana. Após um mapeamento da área a ser avaliada, foram identificados todos os moradores com idade entre 5 e 65 anos para realização de um inquérito parasitológico. Arquivo em PDF. Requer o Adobe Acrobat Reader