In-depth

Causes

Diphtheria

Diphtheria — Comprehensive overview covers symptoms of this infection that's preventable with a vaccine.

Genital herpes

Rubella

Swimmer's ear

Swimmer's ear, an infection in the outer ear, is usually caused by bacteria and is more common in ears exposed to water for long periods.

Toxoplasmosis

Toxoplasmosis is an infection caused by a parasite. It doesn't make most people ill, but infants and people with HIV/AIDS are at risk of complications.

Risk factors

HIV/AIDS

Hodgkin's lymphoma

Syphilis

Syphilis, a sexually transmitted infection, first appears as painless sores on your genitals, rectum or mouth. Early diagnosis is important.

Symptoms

Runny nose

Tests and diagnosis

Chest X-rays

Complete blood count

A complete blood count can be used to evaluate your overall health, detect a wide range of disorders, or monitor a medical condition or treatment.

CT scan

Needle biopsy

Jan. 02, 2014