Primary Prophylaxis: Indications. 1  Prophylaxis should be administered to all HIV-infected patients with a CD4 count of <200 cells/ÂµL, a history of an AIDS-defining illness, or a history of oral thrush. PCP prophylaxis also is indicated for patients with CD4 counts of >200 cells/ÂµL in the presence of a CD4 percentage <14%.
Incubation Period. The incubation period depends on the causative agent. For example the incubation period of meningococcal meningitis is 2-10 days while the incubation for hemophilus meningitis is much shorter ranging from 2-4 days.However the range of incubation for most organisms causing meningitis is 2 days to 2 weeks. Viral meningitis-The most common but less serious form of meningitis. 2  Enteroviruses are the most common viral cause of meningitis in the US. 3  Coxsackie, herpes virus, arbovirus, measles and varicella are other common meningitis causing viruses.
An incubation period refers to the amount of time between the moment a person or animal is exposed to a bacteria or virus and the appearance of the first symptoms.However, an incubation period can also refer to the length of time necessary for oviparous animals to develop while inside the egg.epatitis A can have an incubation period of up to 50 days, while for rabies, the incubation period can be as long as one year. Diseases with shorter incubation periods include the common cold, dengue hemorrhagic fever and cold sores or herpes, with an average of 10 hours.