DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Gloved hand holding a syringe administers Hepatyrix vaccine to inoculate against Hepatitis A and typhoid. Hepatitis A is an infectious liver disease caused by the hepatitis A virus (HAV). Typhoid is a disease caused by the bacteria Salmonella typhi. Both diseases are transmitted through contaminated food and water.
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