Since the start of the AIDS epidemic, PCP has been closely associated with AIDS. Because it only occurs in an immunocompromised host, it may be the first clue to a new AIDS diagnosis if the patient has no other reason to be immunocompromised (. taking immunosuppressive drugs for organ transplant ). An unusual rise in the number of PCP cases in North America, noticed when physicians began requesting large quantities of the rarely used antibiotic pentamidine , was the first clue to the existence of AIDS in the early 1980s.  
The best time is late fall at the beginning for the flu season – late October or early November. The CDC (Centers for Disease Control and Prevention), however, is currently recommending “one dose every year in the fall or winter beginning vaccinations as soon as the vaccine is available and continuing throughout the influenza season or until the supply is depleted”. I still say late October or early November is best . Flu season really get underway after we all travel around the holidays giving away our germs with our gifts and generally getting run down. If you miss getting it before the holiday, by all means go ahead and get it whenever. I always get mine in early November so it will last longer into the spring but that’s just my preference.
When eosinophilic pneumonia is related to an illness such as cancer or parasitic infection, treatment of the underlying cause is effective in resolving the lung disease. When due to AEP or CEP, however, treatment with corticosteroids results in a rapid, dramatic resolution of symptoms over the course of one or two days. Either intravenous methylprednisolone or oral prednisone are most commonly used. In AEP, treatment is usually continued for a month after symptoms disappear and the x-ray returns to normal (usually four weeks total). In CEP, treatment is usually continued for three months after symptoms disappear and the x-ray returns to normal (usually four months total). Inhaled steroids such as fluticasone have been used effectively when discontinuation of oral prednisone has resulted in relapse .  Because EP affects the lungs, individuals with EP have difficulty breathing. If enough of the lung is involved, it may not be possible for a person to breathe without support. Non-invasive machines such as a bilevel positive airway pressure machine may be used. Otherwise, placement of a breathing tube into the mouth may be necessary and a ventilator may be used to help the person breathe.