Strep throat is the common term for “Streptococcal Pharyngitis.” Streptococcus is a type of bacteria that cause a number of different diseases (Streptoccocus pneumoniea causes bacterial pneumonia for example). You need to be in contact with the bacteria to get the disease, but it can spread through droplets in air and on surfaces a sick person touched.
If the strep bacteria have colonised your throat, then they can develop into strep throat. This can happen if your immune system or another bacteria is suppressing the strep or competing with it for nutrients and the competitor/ inhibitor dies off which would allow the strep to develop into strep throat.
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