What is COVID-19 and how is it different from the flu?

COVID-19 is caused by the SARS-CoV-2 virus, while flu is caused by influenza viruses. COVID-19 tends to spread more easily than flu, can cause more serious illness in some people, and has a longer incubation period (2-14 days vs 1-4 days for flu). COVID-19 also more commonly causes loss of taste/smell and can lead to long-term symptoms (long COVID).

How does COVID-19 spread?

COVID-19 spreads primarily through respiratory droplets and aerosols when infected people breathe, talk, cough, or sneeze. It can also spread by touching contaminated surfaces and then touching your face. The virus spreads most easily in indoor, crowded settings with poor ventilation, and people can spread it even before showing symptoms.

What are the symptoms of COVID-19?

Common symptoms include fever, cough, fatigue, loss of taste or smell, sore throat, headache, body aches, and difficulty breathing. Symptoms typically appear 2-14 days after exposure. Some people have mild or no symptoms, while others develop severe illness requiring hospitalization.

Are COVID-19 vaccines still effective against new variants?

Yes, COVID-19 vaccines continue to provide strong protection against severe disease, hospitalization, and death, even as new variants emerge. Updated booster shots are formulated to better match circulating variants. While breakthrough infections can occur, vaccinated individuals typically experience milder illness.

Long COVID refers to new, returning, or ongoing health problems people experience four or more weeks after first being infected with COVID-19. Symptoms can include fatigue, brain fog, shortness of breath, heart palpitations, and many others. It can affect anyone, even those who had mild initial infections.

Where are COVID-19 cases increasing?

COVID-19 activity varies by region and season. Check the live outbreak data above for real-time information on current COVID-19 trends, variant surveillance, and hotspots worldwide.

Kentucky

COVID-19 in Kentucky

COVID-19 is a highly contagious respiratory illness caused by the SARS-CoV-2 virus. It primarily affects the lungs but can impact multiple organ systems, varying from mild to severe globally. Track COVID-19 activity and outbreaks specific to Kentucky.

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What is COVID-19?

COVID-19 is caused by the SARS-CoV-2 virus that emerged in late 2019. While most people experience mild to moderate respiratory illness, it can cause severe disease and death, particularly in older adults and those with underlying health conditions. The virus continues to evolve, producing new variants that can affect transmissibility, severity, and vaccine effectiveness.

Symptoms

Fever or chills
Cough (often dry)
Shortness of breath or difficulty breathing
Fatigue and body aches
Loss of taste or smell
Sore throat, congestion, or runny nose
Headache
Nausea, vomiting, or diarrhea

Transmission

COVID-19 spreads primarily through respiratory droplets and aerosols when an infected person coughs, sneezes, talks, or breathes. The virus can also spread by touching surfaces contaminated with the virus and then touching the face. Transmission can occur from people who are asymptomatic or pre-symptomatic.

Contagious Period: 2 days before symptoms appear to 10+ days after symptom onset

Prevention

COVID-19 vaccination (primary series + boosters)
Wear masks in crowded indoor settings
Maintain physical distancing when possible
Hand hygiene (wash frequently with soap and water)
Improve ventilation in indoor spaces
Stay home when sick and test if symptomatic
Isolation for positive cases

Kentucky Health Resources

Local health department information and state-specific prevention guidance

We're Monitoring Kentucky

Our AI-powered surveillance continuously monitors COVID-19 activity across Kentucky. We track data from state health departments, local hospitals, CDC reports, and 50+ global health sources to provide early warning of emerging threats.

Get instant push notifications when COVID-19 activity increases in Kentucky or your specific county.

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Kentucky Health Department

For official state health alerts, vaccination locations, and public health guidance specific to Kentucky, visit your state health department's website.

→ Kentucky Department of Health → Find COVID-19 Vaccination Near You → CDC Travel Health Notices

Protecting Yourself in Kentucky

Whether you live in Kentucky, are traveling there, or have family in the state, understanding COVID-19 prevention is essential. Follow these evidence-based prevention measures:

Prevention Measures

COVID-19 vaccination (primary series + boosters)
Wear masks in crowded indoor settings
Maintain physical distancing when possible
Hand hygiene (wash frequently with soap and water)
Improve ventilation in indoor spaces
Stay home when sick and test if symptomatic
Isolation for positive cases

When to Seek Care

If you experience symptoms of COVID-19 in Kentucky, contact your healthcare provider immediately. Early diagnosis and treatment improve outcomes significantly.

Emergency symptoms: If you experience severe symptoms, difficulty breathing, or signs of dehydration, call 911 or go to your nearest emergency room.

Expert Resources & References

Trusted information from leading health organizations

CDC

Official guidance from the U.S. Centers for Disease Control and Prevention

View CDC Resources →

WHO

Global disease surveillance and guidelines from the World Health Organization

View WHO Resources →

Research

Latest peer-reviewed research and clinical studies

View Research →

Medically Reviewed Content

Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.

Last reviewed: 2026-03-04

Frequently Asked Questions

Common questions about COVID-19 answered by our epidemiology team

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