Читать книгу Basic Virology - Martinez J. Hewlett - Страница 54

1 In the case of rabies virus, how would you classify humans with respect to their role as a host?

2 What characteristics are shared by all hepatitis viruses?

3 Using the data presented in Table 3.1, answer the following questions:Which of the viruses in the table are vectored by mosquitoes?Which of the viruses in the table are transmitted in an aerosol?Which of the viruses in the table are transmitted by injection of blood?Which of the viruses in the table are neurotropic?

4 You are a viral epidemiologist studying the population of Spitzbergen Island off the coast of Norway (see Figure 3.2). Suppose that a team of scientists plans to visit this island by special boat during the Christmas holiday season. How might this visit change the pattern of respiratory infections you have been observing? What criteria must exist for this visit to have an effect on the pattern of viral respiratory illness on the island?

5 You have isolated two mutant strains of virus Z – mutant 1 and mutant 2. Neither strain can replicate when infected into cells, but either can be propagated in cell culture when coinfected with mutant virus 3. When you coinfect cultured cells with mutants 1 and 2 together, infection proceeds, but only mutant 1 and mutant 2 can be recovered from the infected cells. What is the best explanation of these results?