Question 1
Immunotherapies such as
immunotoxins are being tested to treat
◦ pertusis.
◦ tetanus.
◦ pneumonia.
◦ HIV.
◦ measles.
Question 2
It is difficult to make a vaccine against HIV because
◦ the virus mutates rapidly.
◦ it is too expensive.
◦ it is a retrovirus.
◦ not enough is known about it.
◦ it contains reverse transcriptase.