Hi
Welcome to the MedHelp forum!
This (Pneumocystis carinii) is an opportunistic infection. The infection flares if a person is immunocompromised ie has a weak immune system like in HIV, cancers, on chemotherapy, radiotherapy or prolonged illness. Hence a mild cough can be due to viral and other bacterial and allergic causes will need to be looked into. If you have been in sexual contact with a person of unknown HIV status and feel there is a possibility, then it is best to get complete HIV screening at 1, 3 and 6 months post exposure. Consult a PCP to treat the cough, which in all probability will need decongestants or anti allergics or antibiotics.
Since I cannot examine you and know other related conditions you may be having, nor is a detailed history possible on net, I have listed the various possibilities that should be looked into. Please consult your PCP to run tests and examination to clinch a diagnosis. Take care!
The causitive organism has been re-named. The new term is Pneumocystis jiroveci Pneumonia.
For treatment protocols search Pubmed.
The organism is often found in healthy lungs, but becomes a problem for those who are immunocompromised, specifically those with HIV.
There are varying degrees of infection and it is certainly possible top have an initial presentation consisting of a non-productive cough.
Presuming you are truthful and based upon your other posts it would be reasonable and prudent for you to have a complete HIV screen.