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.
Supplement. The incubation period is the initial stage of an infectious disease. During this stage the pathogens are actively dividing and growing in number. The duration of incubation period may vary depending on various factors, such as the immunocompetence of the host and the virulence of the pathogen.