Delta Variant: What We Know About the Science


August 18, 2021

illustration of people wearing masks and one person not wearing a mask

Delta Variant: What We Know About the Science

Delta is currently the predominant strain of the COVID-19 virus in the United States and it’s highly contagious. Here is what CDC scientists have recently learned:

Infections and Spread:  The Delta variant causes more infections and spreads faster than early forms of the COVID-19 virus.

Vaccines:  Vaccines in the United States are highly effective, including against the Delta variant.

Masks:  Layered prevention strategies, such as wearing masks, are needed to reduce the transmission of this variant – even if you’re vaccinated.

Learn more about the Delta variant and what you can do to help protect yourself.

Sun Exposure Causes More Than Skin Cancer

Having too much exposure to the sun has been linked to skin cancer. But did you know that there are other effects on your health from too much sun besides skin cancer? Too much UV radiation from the sun can cause health issues such as early aging of the skin, problems with the immune system, and eye damage. Learn about the risks so you will be better able to protect yourself and enjoy the sun safely.

Bell’s Palsy

One of the most common causes of facial paralysis is Bell’s palsy, which usually affects just one side of the face. Scientists think that a viral infection makes the facial nerve swell or become inflamed. You are most likely to get Bell’s palsy if you are pregnant, diabetic, or sick with a cold or flu. Learn more about the symptoms and treatment.


Leukodystrophies are a group of rare genetic disorders that affect the central nervous system (CNS). The CNS is made up of your brain and spinal cord. Leukodystrophies damage the white matter of your CNS. When the white matter is damaged, it can slow down or block the signals between nerve cells. This can cause many different symptoms, including trouble with movement, vision, hearing, and thinking.

Salmonella Infections

Salmonella is the name of a group of bacteria and is a common cause of foodborne illness. Salmonella occurs in raw poultry, eggs, beef, and sometimes on unwashed fruit and vegetables. You also can get infected after handling pets, especially reptiles like snakes, turtles, and lizards. Most people get better without treatment, however, the infection can be more serious in older adults, infants, and people with chronic health problems. Learn more about the symptoms, diagnosis, and treatment.

Fish and Spinach Bake

This versatile Fish and Spinach Bake recipe can be made with any kind of fish. Try substituting chicken or changing the flavor by adding lemon juice or lemon pepper.