NAVLE Reproductive

Bovine Chlamydiosis Study Guide

March 28, 2026 25 min read 33 views
Chlamydiosis is an important cause of reproductive failure in cattle caused by obligate intracellular bacteria of the genus Chlamydia.

Overview and Clinical Importance

Chlamydiosis is an important cause of reproductive failure in cattle caused by obligate intracellular bacteria of the genus Chlamydia. The disease primarily manifests as late-term abortion, stillbirth, and birth of weak calves, with significant economic impact on cattle operations worldwide. Understanding chlamydial infections is essential for NAVLE success due to their zoonotic potential and clinical significance in bovine reproductive medicine.

High-YieldChlamydiosis is a ZOONOTIC disease. Pregnant women must avoid contact with aborting cattle and contaminated materials. Human infection can cause severe illness including septic abortion, DIC, and death.
Species Primary Disease Clinical Significance
Chlamydia abortus Abortion, placentitis MOST IMPORTANT for reproductive disease. Major zoonotic concern.
Chlamydia pecorum Polyarthritis, encephalomyelitis, enteritis Common in calves. Causes sporadic bovine encephalomyelitis (SBE).
Chlamydia psittaci Respiratory disease, occasional abortion Less common in cattle. Associated with avian contact.

Etiology

Causative Agents

Bovine chlamydiosis is caused by obligate intracellular Gram-negative bacteria belonging to the family Chlamydiaceae. Three species are primarily associated with disease in cattle:

NAVLE TipC. abortus was formerly classified as C. psittaci serovar 1. When exam questions reference 'enzootic abortion' or late-term bovine abortion with placentitis, think C. abortus first.

Biphasic Developmental Cycle

Chlamydiae have a unique biphasic developmental cycle involving two distinct morphological forms. This is a HIGH-YIELD concept for board examinations.

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