An AIDS patient presented to OPD with dyspnoes and respiratory illness; Which of the following is suitable to diagnose the oppounistic infection commonly seen in AIDS patient

* Pneumocystis jirovecii pneumonia is more common in AIDS patients. * Fever, unproductive cough, progressive shoness of breath are presenting complaints. Diagnosis is confirmed by: - * Fungal cysts (Toluidine blue) from BAL * Fungal DNA detection by PCR Ref:- Greenwood medical microbiology 18th ed; pg num:- 570