Ever since Santa Clara County reported the first patient with the coronavirus in the Bay Area on Jan. 31, the disease has spread throughout all nine counties in the region, with the number of confirmed cases escalating at a rapid pace. Since officials issued a shelter-at-home order, cases in the Bay Area jumped from 798 on March 17 to 14,341 on June 2, with Santa Clara County accounting for about a fifth of the region’s patients and more than a quarter of the region’s 448 deaths. San Mateo County has reported the fourth-highest number of cases in the region after Alameda, Santa Clara and San Francisco counties. County health leaders have said the number of confirmed cases is expected to rise as more testing becomes available. Palo Alto Online, the Mountain View Voice and the Almanac have put together this series of charts to help you understand the proliferation of COVID-19 infections on the Peninsula. The charts, which can only be viewed from a Google Chrome browser, will be updated as more information is released.

SANTA CLARA COUNTY

According to data from the county Public Health Department, men and women have been equally vulnerable to infection.  

Men accounted for half of the 2,819 confirmed cases and 60% of the 143 deaths reported in Santa Clara County on June 2.

Women accounted for half of the cases and 40% of all deaths reported on June 2.

SAN MATEO COUNTY

Santa Mateo County began publicly releasing data on coronavirus cases and deaths by gender on April 7. As of June 1, women accounted for 53% of the county’s 2,188 confirmed cases, and 52% of the 84 deaths while men accounted for 47% of all cases and 48% of all deaths.

CASES AND DEATHS BY AGE

Santa Clara and San Mateo counties are also tracking coronavirus cases and deaths by age.

In both counties, residents in every age group, from those 20 years old and younger to those 90 years and older, have been infected by the virus.

In Santa Clara County, people ages 41-50 represent the largest segment of the population infected with the virus and account for only 3.5% of the county’s deaths.

In San Mateo County, the rate of infection is highest in the 30-39 age group.  

The rate of infection does not appear to ascend with age in Santa Clara County, according to the county’s data. Those ages 80 and older have fewer reported cases than those ages 71-80, who have fewer reported cases than those ages 61-70.

In San Mateo County, those in the 30-39 age group represent the largest segment of the population infected with the virus, followed by those in the 40-49 age group.

Those ages 71-80 account for 28% of the deaths in Santa Clara County, followed by those ages 81-90, who represent 21% of the death toll.

In San Mateo County, no one under age 29 has died from the disease, according to statistics from the county Health Department. Those ages 90 and older account for 35% of the county’s deaths.

Find comprehensive coverage on the Midpeninsula’s response to the new coronavirus by Palo Alto Online, the Mountain View Voice and the Almanac here.