Assessing classroom and laboratory spread of COVID-19 in a university after elimination of physical distancing.

The objective of this study was to assess COVID-19 classroom transmission in the university setting when physical distancing was eliminated. Data was collected in fall 2021 at a private university. Universal masking, robust contact tracing, vaccination requirement, and enforced testing were in place.

Benzene exposure in the rubber coating industry--a follow-up.

This paper is a follow-up on thirty-eight workers exposed from 1 to 24 years to average benzene concentrations generally between 5 and 50 ppm, but as high as 90 (peak of 140) in the case of one worker. One individual was diagnosed as suffering from mild benzene poisoning and a small number of workers in the group had blood changes considered abnormal, but blood dyscrasia or leukemia has not developed in 13 years after benzene use was terminated in 1964. The population studied was small, but the data, nevertheless, would appear to support the former ACGIH TLV of 25 ppm.