What is the recommended prophylaxis for all HIV patients with a CD4 count of less than 100?

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The recommended prophylaxis for HIV patients with a CD4 count of less than 100 is Bactrim (sulfamethoxazole/trimethoprim). This is primarily used to prevent Pneumocystis jirovecii pneumonia (PCP), which is a serious opportunistic infection that can occur in individuals with significantly compromised immune systems, such as those with advanced HIV/AIDS.

PCP prophylaxis is indicated when the CD4 count falls below 200 cells/mm³; however, many guidelines recommend starting it when the count is below 100 cells/mm³ as the risk of developing this infection increases significantly. Bactrim is effective against the organism that causes PCP and has been shown to significantly reduce the incidence of this infection among at-risk populations.

Other options listed do not serve as effective prophylactic agents against PCP. Amoxicillin is generally used for bacterial infections but does not have a role in preventing PCP. Ciprofloxacin is typically used for other types of bacterial infections and is not indicated for prophylaxis against PCP. Clarithromycin, while used to prevent certain infections in some populations, like mycobacterial infections, does not specifically provide prophylaxis against PCP in the same way that Bactrim does. Thus,

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