Streptococcus parasanguinis strain AM27-45

Streptococcus parasanguinis strain AM27-45 is a Gram-positive, cocci-shaped bacterium that exhibits a characteristic arrangement in chains and pairs. This strain is classified as a facultative anaerobe, indicating its ability to thrive in both aerobic and anaerobic environments. It is a mesophilic organism, suggesting optimal growth at moderate temperatures. Strain AM27-45 has no mobility and does not possess flagella, which is consistent with the non-motile nature of many streptococcal species. This strain is characterized by a single replicon and is nonsporulating, meaning it does not form spores as a means of survival in adverse conditions. S. parasanguinis is primarily associated with humans (Homo sapiens), where it can be found within host-associated habitats. This bacterium is known to have several health implications, being implicated in serious conditions such as pneumonia, meningitis, infective endocarditis, and pyogenic osteomyelitis. The presence of S. parasanguinis in the human microbiome highlights its dual role as a free-living organism that can also contribute to disease under certain circumstances. Its association with significant health conditions underscores the importance of understanding the ecological dynamics of human-associated microbiota, particularly how commensal organisms can become pathogenic when the host's environment changes or when immune defenses are compromised.