Oppertunistic infections that commonly occur  in hiv patients who have low cd4 counts .

Of these infections tuberculosis tops the list followed by candidiasis, herpes and various infections causing  diarrea. 

At very low cd4 counts the risk of pcp pneumonia and toxoplasmosis and malignancies is very high.

Treatment with ART by increasing cd4 counts reduces the risk of getting oppertnistic infections.

the latest who guideline says to start ART treatment irrespective of the cd4 count.