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  1. Infection: Bacterial or viral? - Mayo Clinic

    Feb 4, 2023 · Viruses that become resistant to antivirals have affected treatment, including for genital herpes, HIV and, in 2008, for influenza (flu). Treating and preventing bacterial and viral …

  2. Germs: Protect against bacteria, viruses and infections

    Mar 5, 2024 · Viruses are responsible for causing many diseases, including: Common cold. Influenza. Measles. Chickenpox and shingles. Coronavirus disease 2019, also called COVID …

  3. Influenza (flu) - Symptoms and causes - Mayo Clinic

    Oct 22, 2025 · 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 …

  4. Viral gastroenteritis (stomach flu) - Mayo Clinic

    Apr 30, 2025 · Viral gastroenteritis is an intestinal infection that includes signs and symptoms such as watery diarrhea, stomach cramps, nausea or vomiting, and sometimes fever. The …

  5. Debunking COVID-19 myths - Mayo Clinic

    Oct 24, 2025 · No. Viruses can only spread between living beings and can't travel on radio waves and mobile networks. Most often, this myth calls out 5G mobile networks. But the COVID-19 …

  6. Encephalitis - Symptoms and causes - Mayo Clinic

    May 16, 2024 · Encephalitis (en-sef-uh-LIE-tis) is inflammation of the brain. It can be caused by viral or bacterial infections, or by immune cells mistakenly attacking the brain. Viruses that can …

  7. Respiratory syncytial virus (RSV) - Mayo Clinic

    Oct 4, 2023 · Respiratory syncytial virus (RSV) causes infections of the lungs and respiratory tract. It's so common that most children have been infected with the virus by age 2. …

  8. Hepatitis B and Hepatitis C: What’s the difference? - Mayo Clinic

    Aug 29, 2025 · HBV and HCV are viruses that cause liver disease. The symptoms may be the same. But they spread and are treated in different ways.

  9. Diarrhea - Symptoms and causes - Mayo Clinic

    Jan 18, 2025 · Causes A number of diseases and conditions can cause diarrhea, including: Viruses. Viruses that can cause diarrhea include Norwalk virus, also known as norovirus, …

  10. Bronchitis - Symptoms and causes - Mayo Clinic

    Jul 31, 2024 · Causes Acute bronchitis is usually caused by viruses, typically the same viruses that cause colds and flu (influenza). Many different viruses — all of which are very contagious …