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women's t-shirts flea women's t-shirts fleas women's t-shirts yersinia women's t-shirts pestis women's t-shirts yersinia pestis women's t-shirts bubonic plague women's t-shirts bubonic women's t-shirts black death women's t-shirts black plague women's t-shirts plague women's t-shirts gram negative women's t-shirts gram-negative women's t-shirts micrograph women's t-shirts bacteria women's t-shirts micrographs women's t-shirts

photographs flea photos fleas photos yersinia photos pestis photos yersinia pestis photos bubonic plague photos bubonic photos black death photos black plague photos plague photos gram negative photos gram-negative photos micrograph photos bacteria photos micrographs photos

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Xenopsylla cheopis (oriental rat flea) with plague mass in poventriculus with finger-like projection into stomach, third day of infection with P. pestis. This flea is the primary vector of plague in most large plague epidemics in Asia, Africa, and South America. Both male and female fleas can transmit the infection. Yersinia pestis is the bacterium that causes bubonic plague (the black death of the middle ages), primarily a flea-carried pathogen of rats. Infection is rapid, causing swelling in the lymph nodes and leading to septicemia and pulmonary infection. Extensive control measures, directed against the rats as well as their fleas, have essentially banished the plague from Europe but there are still many regions of the world where the disease occurs.