14 September 2022 Blog Post: Mid-September COVID Case Numbers

A brief look today at the current incidence and prevalence of COVID-19 cases in Los Angeles County.

Incidence is defined as the number of new cases in the population over a specified period of time. In the calculations below we present a daily rate per 100,000 population (averaged over 7 days to smooth out any reporting delays, such as over weekends and holidays). While we generally expect the start of school to carry with it an increase in transmission risk, this is not being seen at the population level. The graph begins in November and clearly shows the Omicron peak of Winter 2021/2022 along with the slow rise of summer cases that can be attributed to BA.5.

Prevalence rates are also declining in the County. Prevalence is defined as the number of active cases (both new and pre-existing) in a population over a defined time period. Here we estimate the proportion of the population with COVID-19 infection over a one week period. This is currently at 1.4% which is the lowest it has been since the week ending May 24th of this year. We calculate prevalence as a function of test positivity.

The current 1.4% prevalence is higher than that seen in prior years. The prevalence rates were lower for the week ending September 6th in both 2020 (0.3%) and 2021 (0.5%).

𝗦𝗶𝗴𝗻 𝗨𝗽 𝗳𝗼𝗿 𝗢𝘂𝗿 𝗡𝗲𝘄𝘀𝗹𝗲𝘁𝘁𝗲𝗿

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