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1 November 2010 The Influence of Environmental Temperature and Humidity on Temporal Decomposition of Cockroach Allergens Bla g 1 and Bla g 2 in Feces
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Abstract

The aim of the study was to establish a model of the environmental fate of German cockroach (Blattella germanica L.) allergens Bla g 1 and Bla g 2 in feces under controlled and field conditions. Temporal decline (3, 6, and 9 mo) of allergens Bla g 1 and Bla g 2 in the feces protected from cleaning was measured under laboratory and experimental household conditions. The influence of environmental temperature (15, 20, 25, 30, and 35°C) and moisture (53, 75, 85, and 100% RH) on allergen degradation was estimated for 3, 6, and 9 mo. Bla g 1 was more stable than Bla g 2 and the proteins. The proteins and Bla g 2 contents were correlated negatively with the decomposition time; Bla g 1 was not. However, when the content of Bla g 1 in control and exposed tubes was compared, the decrease after exposure was significant at exposure in 35°C, 53 and 100% RH. In laboratory, the shortest half-life (16–38 d) of Bla g 2 was at high temperature and humidity (100% RH at 35°C), whereas the longest half-life (340 d) was at 25°C and 85% RH. In the apartment, the half-life was 406 d. The results indicate that Bla g 1 and Bla g 2 allergens can persist in feces for several months under usual household humidity and temperature.

© 2010 Entomological Society of America
Tomas Erban, Vaclav Stejskal, Radek Aulicky, Iva Krizkova-Kudlikova, Marta Nesvorna, and Jan Hubert "The Influence of Environmental Temperature and Humidity on Temporal Decomposition of Cockroach Allergens Bla g 1 and Bla g 2 in Feces," Journal of Medical Entomology 47(6), 1062-1070, (1 November 2010). https://doi.org/10.1603/ME10048
Received: 22 February 2010; Accepted: 1 July 2010; Published: 1 November 2010
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