Also called: COVID-19 · Coronavirus
Important: This page is general information, not medical advice. It does not recommend or prescribe any treatment. Always consult your doctor or pharmacist before starting, stopping or changing any medicine.
About COVID-19 (Coronavirus Disease 2019)
COVID-19 (coronavirus disease 2019) is an illness caused by a virus. This virus is a coronavirus called SARS-CoV-2. It spreads when a person who has the infection breathes out droplets and very small particles that contain the virus. On this page, you'll find links to resources on important issues such as symptoms, risks, and how you can protect yourself and your family.
We also have pages on:
- COVID-19 testing
- COVID-19 vaccines
- Post-COVID conditions (long COVID)
It sits within Infections and Lungs and Breathing.
The lead U.S. institute for this subject is the National Institute of Allergy and Infectious Diseases.
When to speak to someone. Reading about a topic cannot tell you whether it applies to you. Speak to a doctor or pharmacist if symptoms are severe, sudden, getting worse, or simply not going away — and seek emergency care immediately for chest pain, breathing difficulty, sudden weakness or confusion, or a serious allergic reaction.
Research on COVID-19 (Coronavirus Disease 2019)
10,222 studies areregistered for this condition on ClinicalTrials.gov, the U.S. National Library of Medicine's public registry. A selection is below — the links go straight to the registry entry, not to a summary of ours.
What a registered study does and does not mean. Registration means a study exists and has been declared publicly. It says nothing about whether the treatment being tested works, is safe, or is available to you. Many studies find no benefit — that is what research is for. Never seek out an experimental treatment on the strength of a registry entry alone.
Research currently under way
- A Study to Learn About the Study Medicine Ibuzatrelvir in Adults With COVID-19 Who Are Severely ImmunocompromisedPfizer
- A Multimodal Parent-focused Intervention for Vulnerable Populations in the BronxAlbert Einstein College of Medicine
- Vaccine Responses to SARS-CoV-2 and Other Emerging Infectious DiseasesNational Institute of Allergy and Infectious Diseases (NIAID)
- COVID-19 Experiences in the SELF CohortNational Institute of Environmental Health Sciences (NIEHS)
- Long-term COVID and RehabilitationVA Office of Research and Development
- NCI COVID-19 in Cancer Patients, NCCAPS StudyNational Cancer Institute (NCI)
Research already completed
- Natural History of Systemic and Nasal Mucosal Immunity to Influenza and SARS-CoV-2 in Adults After VaccinationNational Institute of Allergy and Infectious Diseases (NIAID)
- Effects of Immulina TM Supplements With PASC PatientsUniversity of Mississippi Medical Center
- Impact of COVID-19 Vaccines on Cerebrovascular HealthChinese University of Hong Kong
- Basel Long COVID-19 Cohort Study and Digital Long COVID SubstudyUniversity Hospital, Basel, Switzerland
- Couple HOPES and COVIDYork University
- Different Treatment Options Used for Post Covid-19 SyndromeBeni-Suef University
Study data from ClinicalTrials.gov, a service of the U.S. National Library of Medicine. Retrieved 2026-07-30. Registry entries are supplied by study sponsors and investigators; ClinicalTrials.gov does not verify their scientific validity. PocketsInfo is not affiliated with, and not endorsed by, the NLM or the NIH.
Where to read more
Rather than paraphrase, we point you to the primary sources. Every link below is to a government health agency, a national institute or a recognised medical body — grouped by what you are trying to find out.
Start Here
- Coronavirus Disease 2019 (COVID-19)Centers for Disease Control and Prevention
Symptoms
- Post-COVID Conditions (Long COVID): MedlinePlus Health TopicNational Library of Medicine
- Symptoms of COVID-19Centers for Disease Control and Prevention
Diagnosis and Tests
- COVID-19 Testing: MedlinePlus Health TopicNational Library of Medicine
Treatments and Therapies
- COVID-19 Symptoms and Complementary Approaches: What You Need To KnowNational Center for Complementary and Integrative Health
- Know Your Treatment Options for COVID-19Food and Drug Administration
- Treatment Locator: Find COVID-19 MedicationsAdministration for Strategic Preparedness and Response
- Types of COVID-19 TreatmentCenters for Disease Control and Prevention
Prevention and Risk Factors
- Community Respirators and MasksCenters for Disease Control and Prevention
- COVID-19 Vaccines: MedlinePlus Health TopicNational Library of Medicine
- COVID-19: How to Protect Yourself and OthersCenters for Disease Control and Prevention
- People with Certain Medical Conditions and COVID-19 Risk FactorsCenters for Disease Control and Prevention
- Preventing Respiratory VirusesCenters for Disease Control and Prevention
- Preventing Spread of Respiratory Viruses When You're SickCenters for Disease Control and Prevention
- Risk Factors for Severe Illness from Respiratory VirusesCenters for Disease Control and Prevention
Related Issues
- About MIS (Multisystem Inflammatory Syndrome)Centers for Disease Control and Prevention
- Coronavirus and Your Health Coverage: Get the BasicsCenters for Medicare & Medicaid Services
- COVID-19 and BreastfeedingCenters for Disease Control and Prevention
- COVID-19: What People with Cancer Should KnowNational Cancer Institute
- Debunking COVID-19 (Coronavirus) MythsMayo Foundation for Medical Education and Research
- HIV and COVID-19National Institutes of Health, Office of AIDS Research
- Is It Flu, COVID-19, Allergies, or a Cold?National Institutes of Health
- Ivermectin and COVID-19Food and Drug Administration
- Pulse OximetryNational Library of Medicine
Medical subject headings
Clinicians and researchers index this subject under COVID-19. These are the terms to use when searching medical literature.
This page is built from the MedlinePlus health topic record for COVID-19 (Coronavirus Disease 2019), a service of the U.S. National Library of Medicine (NLM), National Institutes of Health. Information is from MedlinePlus.gov. PocketsInfo is not affiliated with, and is not endorsed by, the NLM or the NIH. Retrieved 30 July 2026.