Centers for Disease Control and Prevention.

Summary of Recent Changes
Revisions were made on July 17, 2020 to reflect recent data supporting increased risk of severe COVID-19 among individuals with cancer.
The listed underlying medical conditions in children were also revised to indicate that these conditions might increase risk to better reflect the quality of available data currently.
We are learning more about COVID-19 every day, and new information becomes available.
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People of any age with the following conditions are at increased risk of severe illness from COVID-19:

Cancer

Chronic kidney disease

COPD (chronic obstructive pulmonary disease)

Immunocompromised state (weakened immune system) from solid organ transplant

Obesity (body mass index [BMI] of 30 or higher)

Serious heart conditions, such as heart failure, coronary artery disease, or cardiomyopathies

Sickle cell disease

Type 2 diabetes mellitus

COVID-19 is a new disease. Currently there are limited data and information about the impact of underlying medical conditions and whether they increase the risk for severe illness from COVID-19. Based on what we know at this time, people with the following conditions might be at an increased risk for severe illness from COVID-19:

Asthma (moderate-to-severe)

Cerebrovascular disease

Cystic fibrosis

Hypertension
Immunocompromised state (weakened immune system) from blood or bone marrow transplant, immune deficiencies, HIV, use of corticosteroids, or use of other immune weakening medicines

Neurologic conditions, such as dementia

Liver disease

Pregnancy

Pulmonary fibrosis (having damaged or scarred lung tissues)

Smoking

Thalassemia (a type of blood disorder)

Type 1 diabetes mellitus

Children who have medical complexity, who have neurologic, genetic, metabolic conditions, or who have congenital heart disease might be at increased risk for severe illness from COVID-19 compared to other children.