Malathion Resistance in Aedes aegypti Mosquitoes Raises Public Health Concerns in Suriname

The Aedes aegypti mosquito, a primary vector for diseases like dengue, chikungunya, and Zika, has developed resistance to malathion, a commonly used insecticide in Suriname. This development poses a significant challenge to public health efforts aimed at controlling these viral diseases.

Growing Resistance Confirmed

Minister of Health, Welfare and Labor, André Misiekaba, announced that research indicates malathion is no longer effectively controlling the mosquito population. Suriname News and Suriname Times both reported on the growing resistance.

Challenges in Securing Alternative Pesticides

The search for alternative pesticides is proving demanding. Minister Misiekaba stated that acquiring new pesticides is “not so simple as going to the store and buying something.”

Recent clearance of a debt of approximately 22 million SRD (roughly USD 600,000) to the Pan American Health Organization (PAHO) has allowed Suriname to resume ordering essential chemicals and pesticides. However, delivery times remain a concern.

Support has also been sought from Brazil, but the requested pesticides have not yet been received. Barbados has pledged to provide chemicals for larval control, but logistical challenges with transportation through SLM have prompted exploration of alternative delivery methods via PAHO and COPA.

Scientific Basis for Resistance

The development of malathion resistance in Aedes aegypti is scientifically plausible. Long-term and repeated insecticide use can lead to genetic adaptations in the mosquito, reducing the effectiveness of the insecticide. Malathion, an organophosphate insecticide, disrupts the insect nervous system by inhibiting acetylcholinesterase. DBS Suriname

PAHO recognizes malathion as an approved insecticide for integrated vector control when used correctly. However, international guidelines emphasize the importance of rotating insecticides and continuously monitoring for resistance. If resistance is confirmed through local testing, the continued use of malathion can be counterproductive, necessitating adjustments to the control strategy.

Ongoing Efforts and Public Awareness

Minister Misiekaba emphasized that efforts to combat the mosquito are continuous, day and night. A press conference was scheduled for today to discuss the current chikungunya situation.

Key Takeaways

• Aedes aegypti mosquitoes in Suriname have developed resistance to malathion.
• Securing alternative pesticides is proving challenging due to logistical and procurement delays.
• Continued monitoring and adjustments to vector control strategies are crucial.
• PAHO and other international partners are providing support to Suriname.