搜尋結果
The new guidance brings a unified approach to addressing risks from a range of common respiratory viral illnesses, such as COVID-19, flu, and RSV, which can cause significant health impacts and strain on hospitals and health care workers.
CDC is the nation's leading science-based, data-driven, service organization that protects the public's health. CDC works 24/7 to protect America from health, safety and security threats, both foreign and in the U.S. About CDC. Organization and Mission. Leadership.
- Overview
- COVID-19 Testing for People with a Recent History of Infection
- Protecting Yourself and Others – What You Can Do
- What CDC is doing
Updated Mar. 15, 2023
Print
Reinfection with the virus that causes COVID-19 occurs when you are infected, recover, and then get infected again. You can be reinfected multiple times.
Reinfections are most often mild, but severe illness can occur. If you are reinfected, you can also spread the virus to others. Staying up to date with COVID-19 vaccine and treating COVID-19 illness within a few days of when symptoms start decreases your risk of experiencing severe illness.
Once you have had COVID-19, your immune system responds in several ways. This immune response can protect you against reinfection for several months, but this protection decreases over time. People with weakened immune systems who get an infection may have a limited immune response or none at all. Protection against severe COVID-19 illness generally lasts longer than protection against infection. This means even if you get infected again, your immune response should help protect you from severe illness and hospitalization.
As the virus evolves, new variants with the ability to evade your existing immunity can appear. This can increase your risk of reinfection. Reinfection can occur as early as several weeks after a previous infection, although this is rare.
Interpreting test results in the first 90 days after a previous infection (that is, reinfection) can be challenging. CDC has developed testing guidance explaining which type of test you should take under different circumstances.
If you have tested positive for COVID-19 within the past 90 days and are testing for a possible new infection:
•Use an antigen test.
•Consult a healthcare provider if you have any questions or concerns.
If you were exposed to the virus that causes COVID-19, you should follow exposure guidance, regardless of your vaccination status or if you have had a previous infection. For those who have previously been infected, vaccination offers added protection, especially against reinfection leading to hospitalization. CDC recommends that people ages 6 months and older, including those with previous infections, stay up to date with COVID-19 vaccines.
Regardless of your vaccination status or if you have had a previous infection:
•COVID-19 treatments are available for those eligible.
•You should start treatment as soon as possible, especially if you have COVID-19 symptoms or risk factors that make you more likely to get very sick from COVID-19.
We continue to learn more about reinfections, especially as new SARS-CoV-2 variants emerge. CDC is working with partners and using data to better understand reinfections, including:
•Who is at higher risk of reinfection, especially reinfections that lead to hospitalization
•How soon reinfections occur after a previous infection
•How severe reinfections are compared to initial infections
2024年3月15日 · People with COVID-19 have reported a wide range of symptoms ranging from mild symptoms to severe illness. Symptoms may appear 2-14 days after exposure to the virus. Anyone can have mild to severe symptoms. Possible symptoms include: Fever or chills. Cough. Shortness of breath or difficulty breathing. Fatigue. Muscle or body aches. Headache.
A listing of NIOSH-Approved Particulate Filtering Facepiece Respirators that health care workers can use to help protect themselves from diseases potentially spread through the air such as SARS or Tuberculosis.
2024年5月2日 · COVID-19 testing can help you know if you have COVID-19 so you can decide what to do next, like getting treatment to reduce your risk of severe illness and taking steps to lower your chances of spreading the virus to others. When you get tested: Choose the right type of test for your circumstance.
2024年4月18日 · Key points. Measles is highly contagious. Measles can live for up to 2 hours in an airspace after an infected person leaves an area. Call your doctor immediately if you think you or your child have been exposed. Common ways it spreads. Contact with an infected person.
