Despite great strides in schistosomiasis control over the past several decades in Sichuan Province, China the disease has re-emerged in areas where it was previously controlled. We reviewed historical records and found that schistosomiasis had re-emerged in eight counties by the end of 2004 - seven of 21 counties with transmission control and one of 25 with transmission interruption as reported...

in 1969 and 1976, 830 rodents and carnivores col1ected from north east iran were examined for trichinella spiralis. fifty per cent of golden jackal and 30 percent of red foxes were found infected. the possibility of infection among the rodent was discussed could be considered as new transmission. the results of examination of 1534 total blood samples collected from children up to 15 years old i...

INTRODUCTION Community-wide administration of antibiotics is one arm of a four-pronged strategy in the global initiative to eliminate blindness due to trachoma. The potential impact of more efficient, targeted treatment of infected households depends on the relative contribution of community and household transmission of infection, which have not previously been estimated. METHODS A mathemati...

BACKGROUND Sexual transmission accounts for the majority of HIV-1 infections. In over 75% of cases, infection is initiated by a single variant (transmitted/founder virus). However, the determinants of virus selection during transmission are unknown. Host cell-cell interactions in the mucosa may be critical in regulating susceptibility to infection. We hypothesized in this study that specific im...

Zika virus is a mosquito-borne flavivirus discovered in Africa in 1947. Most persons with Zika virus infection are asymptomatic; symptoms when present are generally mild and include fever, maculopapular rash, arthralgia, and conjunctivitis. Since early 2015, Zika virus has spread rapidly through the Americas, with local transmission identified in 31 countries and territories as of February 29, ...

Many parasites and pathogens cause silent/covert infections in addition to the more obvious infectious disease-causing pathology. Here, we consider how assumptions concerning superinfection, protection and seasonal host birth and transmission rates affect the evolution of such covert infections as a parasite strategy. Regardless of whether there is vertical infection or effects on sterility, ov...

Background: Hepatitis C virus infection (HCV) is a main health problem in our country. It is thought that the transmission of hepatitis C virus (HCV) through the endoscopic procedures is a rare event. The aim of this study was to evaluate the risk of conventional disinfection in the transmission of HCV. Materials and methods: A prospective study, comprising 456 consecutive upper gastrointestin...