The symptoms of AIDS are primarily the result of infections that do not normally develop in people with healthy immune systems. These infections are termed "opportunistic infections." Patients with AIDS have had their immune system destroyed by HIV and are susceptible to such opportunistic infectio...

The symptoms of AIDS are primarily the result of infections that do not normally develop in people with healthy immune systems. These infections are termed "opportunistic infections." Patients with AIDS have had their immune system destroyed by HIV and are susceptible to such opportunistic infec...

Since antibiotics, such as penicillin, became widely available in the 1940s, they have been called miracle drugs. They have been able to eliminate bacteria without significantly harming the other cells of the host. Now with each passing year, bacteria that are immune to antibiotics have become more...