Most common infection, most are transient with few untoward sequelae.
Some are life threatening (e.g., Meningoccus, Diphtheria)
Severe, recurrent, disseminated or persistent lesions occur in Immunocompromised, organ transplant or AIDS.
Bacterial infections are diagnosed on Clinical grounds, supported by smears, culture, testing for immune responses (Serology) & examining for nucleic acids.
Antibacterial drugs can be effective therapy but, resistance can be a problem (e.g.. MRSA)