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112470 author: jmcrookston@mastodon.social 08 Sep 2023 11:03
tags: #COVIDisAirborne #aerobiology #airborne #pathogens #transmissionofpathogens

Of particular note, they did airflow studies and the "droplet nuclei" were found throughout the office.

Furthermore, lack of ventilation already known.

So what on earth are the people who are arguing against aerosol actually fighting?

ABSTRACT. In February 1961, a measles outbreak oc- curred i a pediatric practice in DeKalb County, GA. The source case, a 12-year-old boy vaccinated against measles at 11% months of age, was in the office for one hour on the second day of rash, primarily in a single cxamining room. On examination, he was noted to be coughing vigorously. Seven secondary cases of measles occurred due to exposure in the office. Four children had transient contact with the source patient as he entered or exited through the waiting room; only one of the four had face- to-face contact within 1 m of the source patient. The three other children who contracted measles were never in the same room with the source patient; one of the three arrived at the office one hour after the source patient had left. The risk of measles for unvaccinated infants (attack rate 80%, 4/5) was 10.8 times the risk for vaccinated children (attack rate 7%, 2/27) (P = 022, Fisher exact test, two-tailed). Airflow studies demon. strated that dropiet nuclei generated in the examining room used by the source patient were dispersed through- out the entire office suite. Airborne spread of measles from & vigorously coughing child was the most likely mode of transmission. The outbreak supports the fact that measles virus when it becomes airborne can survive at least one hour. The rarity of reports of similar out- breaks suggests that airborne spread is unusual. Modern office design with tight insulation and a substantial pro- portion

at least one hour. The rarity of reports of similar out- breaks suggests that airborne spread is unusual. Modern office design with tight insulation and a substantial pro- portion of recirculated ventilation may predispose to sirborne transmission. Pediatrics 1985;75:676-683; mea-