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Su Worldometer, è stato pubblicato il resoconto dei primi test sierologici condotti a New York City fino al 1° Maggio:
Coronavirus Death Rate (COVID-19) - Worldometer
Actual Cases (1.7 million: 10 times the number of confirmed cases)
New York State conducted an antibody testing study [
source], showing that 12.3% of the population in the state had COVID-19 antibodies as of May 1, 2020. The survey developed a baseline infection rate by testing 15,103 people at grocery stores and community centers across the state over the preceding two weeks. The study provides a breakdown by county, race (White 7%, Asian 11.1%, multi/none/other 14.4%, Black 17.4%, Latino/Hispanic 25.4%), and age, among other variables.
19.9% of the population of New York City had COVID-19 antibodies. With a population of 8,398,748 people in NYC [
source], this percentage would indicate that
1,671,351 people had been infected with SARS-CoV-2 and had recovered as of May 1 in New York City. The number of confirmed cases reported as of May 1 by New York City was
166,883 [
source], more than 10 times less.
Actual Deaths (23,000: almost twice the number of confirmed deaths)
As of May 1, New York City reported 13,156 confirmed deaths and 5,126 probable deaths (deaths with COVID-19 on the death certificate but no laboratory test performed), for a total of 18,282 deaths [
source]. The CDC on May 11 released its "
Preliminary Estimate of Excess Mortality During the COVID-19 Outbreak — New York City, March 11–May 2, 2020" [
source] in which it calculated an estimate of actual COVID-19 deaths in NYC by analyzing the "excess deaths" (defined as "the number of deaths above expected seasonal baseline levels, regardless of the reported cause of death") and found that, in addition to the confirmed and probable deaths reported by the city, there were an estimated 5,293 more deaths to be attributed. After adjusting for the previous day (May 1), we get 5,148 additional deaths, for a total of actual deaths of 13,156 confirmed + 5,126 probable + 5,148 additional excess deaths calculated by CDC =
23,430 actual COVID-19 deaths as of May 1, 2020 in New York City.
Infection Fatality Rate (23k / 1.7M = 1.4% IFR)
Actual Cases with an outcome as of May 1 = estimated actual recovered (1,671,351) + estimated actual deaths (23,430) =
1,694,781.
Infection Fatality Rate (IFR) = Deaths / Cases = 23,430 / 1,694,781 =
1.4% (1.4% of people infected with SARS-CoV-2 have a fatal outcome, while 98.6% recover).
Mortality Rate by Age
When analyzing the breakdown of deaths by age and condition [
source], we can observe how, out of 15,230 confirmed deaths in New York City up to May 12, only 690
(4.5% of all deaths) occurred in patients under the age of 65 who did not have an underlying medical condition (or for which it is unknown whether they had or did not have an underlying condition).
Underlying illnesses include Diabetes, Lung Disease, Cancer, Immunodeficiency, Heart Disease, Hypertension, Asthma, Kidney Disease, GI/Liver Disease, and
Obesity [
source]
Under 65-year-old (0.09% CMR to date)
85.9% of the population (7,214,525 people out of 8,398,748) in New York City is under 65 years old according to the US Census Bureau, which indicates the percent of persons 65 years old and over in New York City as being 14.1% [
source].
We don't know what percentage of the population in this age group has an underlying condition, so at this time we are not able to accurately estimate the fatality rate for the under 65 years old and healthy.
But we can calculate it for the entire population under 65 years old (both healthy and unhealthy): with 6,188 deaths (26% of the total deaths in all age groups) occurring in this age group, of which 5,498 deaths
(89%) in patients with a known underlying condition, the crude mortality rate to date will correspond to 6,188 / 7,214,525 = 0.09% CMR, or 86 deaths per 100,000 population (compared to 0.28% and 279 deaths per 100,000 for the general population).
So far there has been 1 death every 1,166 people under 65 years old (compared to 1 death every 358 people in the general population)
. And 89% of the times, the person who died had one or more underlying medical conditions.
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