FAQ on COVID-19 Delta variant: symptoms, timeline, and transmissibility
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What is the Delta variant of COVID-19?
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How is the Delta variant different?
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Dr. Nasia Safdar, medical director of infection control at UW Health
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Contagious effect of the Delta
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F. Perry Wilson, MD, Yale Medicine epidemiologist
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What are the COVID-19 delta variant symptoms?
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Delta variant symptoms in adults
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- Headache
- Sore throat
- Runny nose
- Fever
- Persistent cough
Symptoms of delta in vaccinated people
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- Runny nose
- Headache
- Sneezing
- Sore throat
- Persistent cough
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First symptoms of delta variant
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Progression timeline of Delta COVID
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Dr. John Vanchiere, director at LSU Health Shreveport’s Center for Emerging Viral Threats
Comparison with other variants of COVID-19
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Delta vs. Omicron
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- Omicron is less likely to send patients to hospitals. Furthermore, if adults need hospitalization, they are less likely to be admitted to ICU.
- Omicron causes less damage to lung cells, resulting in less severe disease than the Delta.
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Dr. Waleed Javaid, director of infection prevention and control at Mount Sinai Downtown in New York City
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Delta vs. Delta Plus
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Can a vaccinated person spread Delta?
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David O’Connor, a virologist at the University of Winsconsin-Madison
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Reaching herd immunity with Delta – mission impossible
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What is “herd immunity”?
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- When a substance is entirely unavailable to infectious agents or non-infectious antigens. This means that the immune system can’t recognize them.
- There should be enough of an antigen present to prevent infection.
- Vaccination is at least 95% of people should prevent the disease.
Why herd immunity is unattainable?
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- Vaccine skepticism for fear of possible complications or reluctance about the benefits is a good example.
- Breakthrough infections prove it is possible to get the virus again and spread it.
- Vaccine distribution disallows certain countries to have even access to COVID-19 vaccines. Even if a single community achieves local herd immunity, outbreaks from surrounding areas might disrupt.