What is CD4 and how do doctors use it to determine HIV progression?

Why is the first step in responding to life-threading situations to assess the situation?

Which of the following best reflects what we know about how the flu virus moves between species? a) the flu virus in a pig is mutated and replicated in alternate arrangements so that humans who eat the pig products can be infected.b) a flu virus from a human epidemic or pandemic infects birds; the birds replicate the virus differently and then pass it back to humans.c) an influenza virus gains new sequences of dna from another virus, such as a herpesvirus; this enables it to be transmitted to a human host.d) an animal such as a pig is infected with more than one virus, genetic recombination occurs, the new virus mutates, the virus is passed to a new species such as a bird, and the virus mutates again and can now be transmitted to humans.

Oprincipal hormônio sexual masculino é a testosterona, que é produzida pelas células do testículo chamadas de células de leydig. o responsável por estimular a produção da testosterona é: escolha uma: a. o hormônio luteinizante. b. a progesterona. c. o hormônio folículo-estimulante. d. a androstenediona. e. o estrógeno.