Zika virus is a viral infection transmitted by Aedes aegypti and Aedes albopictus mosquitoes, which also transmit dengue and chikungunya viruses. Zika virus can also be sexually transmitted. Most cases of Zika virus infection are asymptomatic or present with fever, rash and conjunctivitis. However, Zika infection in pregnancy can result in an array of congenital complications, including microcephaly, referred to as congenital Zika syndrome.
PHO Rounds: Tuberculosis Contact Investigation: Principles and practice
This PHO Rounds will review the principles of TB contact investigation, including transmission risk assessment, prioritizing follow-up based on the source case’s likely infectiousness, the nature of the exposure(s), and factors that increase immunologic vulnerability of exposed individuals to TB disease.