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- Chlamydia – the most sexually transmitted disease in the US
- Meningitis – an inflammation of the lining of the brain or spinal cord
- Neisseria – the leading cause of adult meningitis and for the ancient disease of gonorrhea
- Rickettsia – a unique organism classified between a virus and a bacterium
- Staphylococcus – the cause of various infections, and particularly prevalent in hospitals and care facilities
- Streptococci – the cause of rheumatic fever and various upper respiratory diseases
