Histoplasmosis is caused by the fungus Histoplasma. Stress, trauma, other infections, or suppression of the immune system, such as by HIV , can reactivate the latent virus and symptoms can return. Vibrio cholerae S Madhumitha. People with CMV retinitis have difficulty with vision that worsens over time. Infection can occur in the lungs, retina of the eye, heart, pancreas, liver, colon, testes, and brain.
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