It may take some time to recover from pneumonia, which has a likely cause in the Serratia pathogen. Some people recover their health and resume their regular routines in one to two weeks.
In any damp area where phosphorus-containing compounds or fatty substances build up, the bacteria will flourish. These compounds can be found in toilets, in soap residues left behind in bathing places, and in pet water bowls.
A Gram-negative bacterium known as Serratia marcescens infects a variety of invertebrate and vertebrate hosts, as well as plants, to cause disease (Grimont and Grimont, 1978). It is an opportunistic human infection, and during the past three decades, nosocomial S has steadily increased.
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