Infection: Bacterial or viral? - Mayo Clinic
2023年2月4日 — Viruses. Viruses are bits of genetic information, either RNA or DNA, surrounded by protein. A virus needs a living host, such as a person, plant or animal. To spread, a virus gets into a host's body and then into the host's cells. Then it takes over the host cell's machinery, using it to make more of the virus. Diseases caused by viruses include:
Germs: Protect against bacteria, viruses and infections
2024年3月5日 — Viruses are responsible for causing many diseases, including: Common cold. Influenza. Measles. Chickenpox and shingles. Coronavirus disease 2019, also called COVID-19. Antibiotics kill or block activities bacteria need to live or grow, but antibiotics don't work on viruses. Medicine that treats viral infections is called an antiviral.
Infectious diseases - Symptoms & causes - Mayo Clinic
2022年2月18日 — Viruses. Even smaller than bacteria, viruses cause a multitude of diseases ranging from the common cold to AIDS. Fungi. Many skin diseases, such as ringworm and athlete's foot, are caused by fungi. Other types of fungi can infect your lungs or nervous system. Parasites. Malaria is caused by a tiny parasite that is transmitted by a mosquito bite.
Hantavirus pulmonary syndrome - Symptoms & causes - Mayo Clinic
2022年1月7日 — Inhaling viruses — the most likely form of transmission — when they become airborne from disturbed rodent droppings or nesting materials; Eating food contaminated with mouse saliva, urine or droppings; Touching things contaminated with the virus, such as a nest, and then touching your mouth, eyes or nose; Being bitten or scratched by an ...
Viral gastroenteritis (stomach flu) - Symptoms & causes - Mayo …
2022年1月18日 — You're most likely to get viral gastroenteritis when you eat or drink contaminated food or water. You may also be likely to get gastroenteritis if you share utensils, towels or food with someone who has one of the viruses that cause the condition. Many viruses can cause gastroenteritis, including: Noroviruses.
Common cold - Symptoms and causes - Mayo Clinic
2023年5月24日 — Many viruses can cause a common cold. Rhinoviruses are the most common cause. A cold virus enters the body through the mouth, eyes or nose. The virus can spread by: Droplets in the air when someone who is sick coughs, sneezes or talks. Hand-to-hand contact with someone who has a cold.
Influenza (flu) - Symptoms and causes - Mayo Clinic
Influenza viruses are constantly changing, with new strains appearing often. A person's first flu infection gives some long-term protection against similar strains of flu. But the vaccines offered each year are made to match the flu virus strains that are most likely to spread that season.
Bell's palsy - Symptoms and causes - Mayo Clinic
2024年3月15日 — Although the exact reason Bell's palsy occurs isn't clear, it's often related to having a viral infection. Viruses that have been linked to Bell's palsy include viruses that cause: Cold sores and genital herpes, also known as herpes simplex. Chickenpox and shingles, also known as herpes zoster.
Coronavirus disease 2019 (COVID-19) - Symptoms and causes
These viruses cause illnesses such as the common cold, severe acute respiratory syndrome (SARS), Middle East respiratory syndrome (MERS) and coronavirus disease 2019 (COVID-19). The virus that causes COVID-19 spreads most commonly through the air in tiny droplets of fluid between people in close contact.
Diarrhea - Symptoms and causes - Mayo Clinic
2024年8月3日 — Viruses. Viruses that can cause diarrhea include Norwalk virus, also known as norovirus, enteric adenoviruses, astrovirus, cytomegalovirus and viruses that cause hepatitis. Rotavirus is a common cause of sudden childhood diarrhea.