Carbon dioxide exposure of nineteen cellar workers and twenty nonexposed controls in a medium size brewery was assessed by determining base excess and standard bicarbonate of the plasma before work on Monday and after work on Monday and Friday. Standard bicarbonate averaged 0.6mEq/L higher in the cellar workers than the controls when samples taken at the same time were compared. This difference was not statistically significant. Standard bicarbonate and hemoglobin concentration declined significantly in both groups between Monday before work and Friday after work, suggesting that hemodilution had occurred. This may have been related to the comsumption of large amounts of beer or other fluid. The air breathed by three cellar workers was monitored continuously during working hours for one wk. Carbon dioxide concentrations varied widely, but yielded a time-weighted average of 1.08% carbon dioxide. The time-weighted average was inordinately difficult to establish under the working conditions in the brewery and was irrelevant with respect to acutely hazardous exposures.

Adult↗

PubMedDate not supplied

Determinants of airborne infection.

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Air Microbiology↗

PubMedDate not supplied

André Cournand.

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Animals↗

PubMedDate not supplied

Indoor spread of respiratory infection by recirculation of air.

Stimulated by an outbreak of measles that was spread throughout a school by the ventilating system, we looked into the possibility of preventing this hazard in air conditioned buildings. The amount of air recirculated by air conditioning systems increases as the temperature difference between indoor and outdoor air increases and often exceeds 70 per cent. Germicidal u.v. radiation in central supply ducts seems almost ideally suited for disinfecting recirculated air, being effective, safe, and cheap. The effectiveness of disinfecting recirculated air in blocking person to person transmission of airborne infection can be predicted to be great at the beginning of a potential outbreak and negligible during an established epidemic. Infection introduced by the air conditioning process, recently implicated in causing Legionnaires' Disease, might also be prevented. Air disinfection would supplement immunization in the control of respiratory infection and might be cost effective.

Air Conditioning↗