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  1. Nov 4, 2023 · Products and services What's the concern about COVID-19 variants? Are they more contagious? Answer From Daniel C. DeSimone, M.D. Concern over variants, sometimes called strains, of the virus that causes COVID-19 is based on how the virus might change. A virus could get better at infecting people, spread faster or cause people to get sicker.

  2. 4 days ago · CDC is tracking a SARS-CoV-2 variant called BA.2.86 and working to better understand its potential impact on public health. This update follows CDC’s most recent BA.2.86 update on September 15, 2023. Find more information about virus trends in your area and tips to help you stay healthy during the holidays. What to know about BA.2.86

    • Overview
    • COVID-19 Vaccines
    • mRNA Vaccine
    • Vector Vaccine
    • Subunit Vacccine

    This article explains the different types of COVID-19 vaccines and how they work, including mRNA vaccine, vector vaccine, protein subunit vaccine etc., and also provides information on FDA's approval for each type of COVID-19 vaccines.

    A coronavirus disease 2019 (COVID-19) vaccine can prevent you from getting COVID-19 or from becoming seriously ill or dying due to COVID-19. Different types of vaccines work by causing the immune system to create antibodies to fight COVID-19.

    The mRNA vaccine gives your cells instructions for how to make the S protein found on the surface of the virus, which causes your body to create antibodies that will fight the virus if you later become infected with it. Both Pfizer and Moderna use this type of vaccine.

    In a vector vaccine, material from the virus is placed in a modified version of another virus, giving your cells instructions to make copies of S proteins; once displayed on cell surfaces, your immune system creates antibodies and defensive white blood cells that will fight off infection if exposed later. Janssen/Johnson & Johnson uses this type of...

    This type contains only parts that best stimulate immunity; harmless S proteins are included so when recognized by immune system it creates antibodies and defensive white blood cells that will fight off infection if exposed later.

  3. Nov 3, 2023 · COVID-19 (coronavirus disease 2019) is a respiratory illness caused by the SARS-CoV-2 virus. It is very contagious, and spreads quickly. Most people with COVID-19 have mild respiratory symptoms that feel much like a cold or flu.

  4. Nov 3, 2023 · COVID-19 is a contagious respiratory disease caused by infection with the virus SARS-CoV-2. It usually spreads between people who are in close contact. The virus spreads through respiratory droplets released when someone breathes, coughs, sneezes, talks or sings. These droplets can land in the mouth or nose of someone nearby or be inhaled.

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