# What Disease Do Diplococci Cause?

> Diplococci — spherical bacteria that grow in pairs — cause diseases such as pneumonia, not strep throat, syphilis, or TB. A Sanitation answer for the Texas barber exam.

Canonical: https://fadejunkie.com/practice/sanitation/diplococci-pneumonia  
Last updated: 2026-08-11

**The answer is pneumonia. Diplococci are paired spherical bacteria, and that pairing is exactly what's linked to pneumonia.**

Strep throat comes from streptococci, which grow in chains, not pairs. Syphilis is caused by a spirochete, and tuberculosis comes from a rod-shaped bacillus. Knowing the shape tells you the bug — pairs mean diplococci, and diplococci means pneumonia.

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