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

Melanie Koinari Australian Institute of Tropical Health and Medicine, James Cook University, Smithfield, Australia;

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Brogan Amos Australian Institute of Tropical Health and Medicine, James Cook University, Smithfield, Australia;

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Michael Townsend Australian Institute of Tropical Health and Medicine, James Cook University, Smithfield, Australia;

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Stephan Karl Australian Institute of Tropical Health and Medicine, James Cook University, Smithfield, Australia;
Papua New Guinea Institute of Medical Research, Papua, New Guinea

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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.

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Author Notes

Address correspondence to Melanie Koinari, Australian Institute of Tropical Health and Medicine, Bldg. E4, James Cook University, 1/14-88 McGregor Rd., Smithfield, Queensland 4878, Australia. E-mail: melanie.koinari@jcu.edu.au

Financial support: This work received funding from Innovation Connections Researcher Placement grant (ICG001564) and Australian Blue Cypress Pty Ltd.

Data availability: The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Authors’ addresses: Melanie Koinari, Brogan Amos, and Michael Townsend, Australian Institute of Tropical Health and Medicine, James Cook University, Smithfield, Australia, E-mails: melanie.koinari@jcu.edu.au, brogan.amos@jcu.edu.au, and michael.townsend@jcu.edu.au. Stephan Karl, Australian Institute of Tropical Health and Medicine, James Cook University, Smithfield, Australia, and Papua New Guinea Institute of Medical Research, Papua, New Guinea, E-mail: stephan.karl@jcu.edu.au.

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