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CDC's best estimate: 35% of those infected with COVID-19 asymptomatic

CDC's best estimate: 35% of those infected with COVID-19 asymptomatic
Posted at 2:30 PM, May 22, 2020
and last updated 2020-05-22 17:30:13-04

The CDC has issued its “best estimates” on the proportion of those who are infected with COVID-19 being asymptomatic, as well as estimates on the virus’ fatality rate.

According to the model's “best estimates,” 35% of those infected with COVID-19 are asymptomatic. The models also indicate that the virus is fatal for .4% of those with symptomatic infections.

The models give five different scenarios. Four of the five scenarios are based on parameter values that represent the lower and upper bounds of disease severity and viral transmissibility. The fifth scenario represents a current best estimate about viral transmission and disease severity in the United States, with the same caveat: that the parameter values will change as more data become available.

In two of the worst case scenarios, the coronavirus would be fatal for up to 1% of those with symptomatic infections. The range of those who are asymptomatic is 20% to 50%, based on the models.

The CDC’s models also show that between 2.8% to 4.1% of all symptomatic infections result in hospitalizations, with the CDC’s best estimate being 3.4%.

The model estimates that it takes an average of six days from infection to symptom onset. The model also estimates that 40% of transmissions occur prior to symptom onset.

The CDC offered the following disclaimers about the information:

  • Are estimates intended to support public health preparedness and planning.
  • Are not predictions of the expected effects of COVID-19.
  • Do not reflect the impact of any behavioral changes, social distancing, or other interventions.

To read the full data, click here.

Coronavirus Testing Sites - Kern County

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State-Provided Sites
  • Must have an appointment
  • Free, but if have insurance they will bill
  • No screening criteria

Kern County Fairgrounds
1142 South P Street, Building 4, Access Gate 27
Mojave Veterans Hall
15580 O Street, Mojave
Arvin Public Health
204 S Hill Street, Arvin
5th District Drive-Thru at The Prado Senior Center
2101 Ridge Road



County-Provided Sites
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  • Free
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  • Operating with existing provider

Oildale - Good Samaritan Hospital
901 Olive Drive, Bakersfield
  • For Registration call (661) 215-7725
  • Drive-Thru Only
  • Hours: Monday - Friday 8 am - 8 pm, Saturday 8 am - 12 pm

Ridgecrest - Ridgecrest Regional Hospital
1081 N. China Lake Blvd, Ridgecrest
  • For Registration: Text the word "testing" to 833-774-4968 Or Call 866-774-9984
  • Drive-Thru Only
  • Hours: Monday - Friday 8:00 am - 10:30 am

Delano - Delano Regional Medical Center
1401 Garces Hwy, Delano
  • No Drive-Thru option
  • Hours: Monday – Friday 9 am – 5 pm

Kern River Valley - Kern Valley Hospital (Coming Soon)
6412 Laurel Ave, Mt Mesa
  • No Drive-Thru option

Tehachapi - Adventist Health Tehachapi Valley
1100 Magellan Dr 93561