December 14, 2021
Last Updated On:
May 12, 2022

Understanding COVID-19 Variants

Your Guide To Everything COVID-19, Omicron, And The Delta Variants.

Last Updated On:
May 12, 2022

Viruses are constantly adapting and changing over time, and COVID-19 is no exception to the rule. As the SARS-CoV-2 virus continues to mutate, new virus variants will occur. 

How Do COVID-19 Variants Work?

If you think about a virus like a tree growing and branching out, each branch on the tree is slightly different from the others. By comparing the branches, scientists can label them according to the differences. These slight differences, or variants, have been studied and identified since the beginning of the pandemic. Some variations allow the virus to spread more quickly or make it resistant to treatments or vaccines. Those variants must be monitored more carefully.

What You Need to Know About COVID-19 Variants

At the start of the coronavirus pandemic, only one strain of the SARS-CoV-2 virus was identified. However, viruses constantly change through mutation, and sometimes these mutations result in new variants of the virus emerging. 

Delta Variant

In mid-2021, a new variant, Delta, emerged, which quickly became the predominant variant of the virus in the United States. The Delta variant was more infectious, which led to increased transmissibility compared to other variants, even in some vaccinated individuals. Delta's contagiousness was 2x more than previous variants.

Omicron Variant

In November 2021, the Omicron variant was first reported in South Africa and quickly spread throughout the globe. Within a few weeks of its first detection in the United States, the Omicron Variant was responsible for more than 59% of all new COVID-19 infections.

The Omicron variant likely will spread more quickly than the original SARS-CoV-2 virus and how easily Omicron spreads compared to Delta remains unknown. The rapid growth rate in Omicron infections is believed to result from a combination of increased transmissibility and the ability to evade immunity conferred by past infection or vaccination (i.e., immune evasion) 1; 2.

The Omicron variant is still in its infancy, and the information available is still unfolding. Preliminary evidence does show it may spread more quickly. But more data is needed to determine the severity of illness it causes or how well available vaccines and medications work against it.

CDC - How Delta COVID-19 Variant Spreads Faster
CDC - How Delta COVID-19 Variants Spreads Faster

What Are Symptoms Of The COVID-19 Omicron Variant?

While the CDC is working with its health officials to gather more data on the Omicron variant, research published in the BMJ showed the following. The top five symptoms reported in the app for omicron infection were:

  1. runny nose 
  2. headache, fatigue (either mild or severe) 
  3. sneezing
  4. sore throat

In addition, the study listed fever, cough, and loss of sense of smell or taste—which were the most common with the original variant—as the covid symptoms to watch out for.

People with COVID-19 have had a wide range of symptoms reported – ranging from mild symptoms to severe illness. Symptoms may appear 2-14 days after exposure to the virus. Regardless of the variant, it is essential to look out for the symptoms that are synonymous with the earlier variants, per the CDC:

  • Fever or chills
  • Cough
  • Shortness of breath or difficulty breathing
  • Muscle or body aches
  • New loss of taste or smell
  • Congestion
  • Nausea or vomiting
  • Diarrhea

The Omicron "Tsunami" And Prevention

The two new variants of COVID-19 are spreading rapidly throughout the country. As of Tuesday, December 28th, The US hit a new record for daily coronavirus cases, as two highly contagious variants — Delta and Omicron — have spread across the country. According to a New York Times database, the seven-day average of US cases topped 267,000 on Tuesday.

"Delta and Omicron are now twin threats driving up cases to record numbers, leading to spikes in hospitalization and deaths," Dr. Tedros Adhanom Ghebreyesus, the WHO's director-general, said at a news conference in Geneva. "I am highly concerned that Omicron, being highly transmissible and spreading at the same time as Delta, is leading to a tsunami of cases."

As cases continue to rise, it is essential, we all stay vigilant in helping slow the spread of COVID-19. Regardless of whether it's Omicron, Delta, or the original SARS-CoV-2 variant, the prevention and steps are the same:

  1. Get the COVID-19 Vaccine: visit to learn more about Vaccine safety, testing, and find a vaccination clinic near you.
  2. Wear masks in public settings where social distancing is limited or high rates of COVID-19 transmissions could occur.
  3. Frequently perform proactive and preventative COVID-19 testing.
  4. Continue frequent cleaning and disinfection of your facility.
  5. Improve indoor quality in buildings through increasing ventilation.
  6. Avoid crowds and poorly ventilated indoor spaces.
  7. Continue social distancing (6 feet apart) in settings where you may be at risk of COVID-19 exposure.
  8. Wash your hands often with soap and water. Be mindful of your hand hygiene and use hand sanitizer if soap and water aren't available.

The virus that causes COVID-19 is constantly changing and will continue to mutate. As a result, new variants of the virus are expected to occur. Taking steps to reduce the spread of infection and following CDC guidance is the best way to slow the emergence of new variants.

For more information on COVID-19 visit:

  1. – About COVID-19 and health guidance
  2. – "How bad is Omicron? Some clues are emerging, and they’re not encouraging"
  3. Pearson - "How Omicron Spread Through South Africa"

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