In China, 87% of confirmed cases were ages 30 to 79 years and 3% were ages 80 years or older. Approximately 51% of patients were male.
In Italy, the median age and prevalence of comorbidities was higher compared with China.
In the UK, the median age of patients was 73 years and males accounted for 60% of admissions in a prospective observational cohort study of more than 20,000 hospitalized patients.
In the US, older patients (ages ≥65 years) accounted for 31% of all cases, 45% of hospitalizations, 53% of intensive care unit admissions, and 80% of deaths, with the highest incidence of severe outcomes in patients ages ≥85 years.
China: 2.1% (median age 7 years)
Italy: 1.2% (median age 4 to 5 years; higher in males but not statistically significant)
Spain: 0.8% (median age 3 years)
UK: <5% (increased risk in males)
US: 1.7% (median age 9.6 years or 17.3 years in critically ill; higher in males but not statistically significant).
Most cases are from familial clusters, or children who have a history of close contact with an infected patient. It appears that children generally don’t spread the virus to household contacts. Unlike adults, children do not seem to be at higher risk for severe illness based on age or sex.
In the UK, the estimated incidence of admission to hospital with confirmed severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in pregnancy is 4.9 per 1000 maternities. Most women were in the second or third trimester. Of these patients, 41% were ages 35 years or older, 56% were from Black or other ethnic minority groups, 69% were overweight or obese, and 34% had preexisting comorbidities.
In the US, according to an analysis of 8200 infected pregnant women, Hispanic and non-Hispanic Black pregnant women appear to be disproportionately affected during pregnancy.
Infection rates in healthcare workers vary. A meta-analysis found that the overall proportion of healthcare workers who tested positive for SARS-CoV-2 among all patients with COVID-19 was 10.1%. This proportion varied according to location: 4.2% in China; 17.8% in the US; and 9% in Italy. The incidence of severe or critical disease and mortality in healthcare workers was lower than the incidence of severe or critical disease and mortality in all patients. In the UK, 14% to 44% of healthcare workers who were screened had evidence of infection detected by molecular or serologic testing. Around 10% of all COVID-19 infections in England between 26 April and 7 June were among patient-facing healthcare workers and social care workers. In the Netherlands, 6% of healthcare workers who were tested were positive for SARS-CoV-2.
The majority of healthcare workers with COVID-19 reported contact in the healthcare setting. In a study of over 9000 cases reported in healthcare workers in the US, 55% had contact only in a healthcare setting, 27% only in a household, 13% only in the community, and 5% in more than one setting.
Current case counts
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