Mosquito Repellent Efficacy of Australian Blue Cypress Callitris intratropica Essential Oil and a Topical Formulation under Laboratory and Field Conditions

Koinari, Melanie, Amos, Brogan, Townsend, Michael, and Karl, Stephan (2023) Mosquito Repellent Efficacy of Australian Blue Cypress Callitris intratropica Essential Oil and a Topical Formulation under Laboratory and Field Conditions. American Journal of Tropical Medicine and Hygiene, 109 (3). pp. 690-697.

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Abstract

Mosquito repellents are important for personal protection against nuisance and potentially infectious mosquito bites. Repellent activity of Australian blue cypress essential oil (EO) and a commercially formulated skin lotion containing blue cypress EO (topical formulation) were compared with 20% DEET (N, N-diethyl-3 toluamide) against mosquitoes under laboratory and field conditions in North Queensland, Australia. On a volunteer's forearm, 1 mL of candidate material was applied to approximately 600 cm2 of exposed skin. When blue cypress EO was applied at various concentrations (0.5%-10.5%), it did not fully prevent mosquito landing or biting. However, a dose-dependent increase, approaching 80% protection, was observed at high EO concentrations. On the basis of these results, three concentrations (5%, 10%, and 20%) of blue cypress EO were selected for complete protection time (CPT) experiments. Topical formulation (undiluted) was also included in CPT experiments. Although some protection was afforded, mosquito landing/probing were still recorded immediately after application for both blue cypress EO and its topical formulation. Specifically, protection declined for blue cypress EO from 80% to 70% (laboratory) and from 93% to 50% (field) within 1 hour. For topical formulation, protection declined from 85% to 75% in the laboratory and from 63% to 50% in the field. In comparison, DEET maintained a 100% protection throughout the testing period of up to 1 h, and there was no landing/probing observed in volunteers who had applied DEET. To conclude, both blue cypress products provided some protection against mosquito bites, which decreased soon after application.

Item ID: 80520
Item Type: Article (Research - C1)
ISSN: 1476-1645
Copyright Information: Copyright © 2023 American Society of Tropical Medicine and Hygiene.
Date Deposited: 14 Feb 2024 23:01
FoR Codes: 42 HEALTH SCIENCES > 4202 Epidemiology > 420207 Major global burdens of disease @ 50%
42 HEALTH SCIENCES > 4206 Public health > 420699 Public health not elsewhere classified @ 50%
SEO Codes: 20 HEALTH > 2002 Evaluation of health and support services > 200299 Evaluation of health and support services not elsewhere classified @ 100%
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