Which of the following statements about dengue is true?

Dengue is indeed a complex disease that is transmitted primarily by mosquitoes in the Aedes genus, specifically Aedes aegypti and Aedes albopictus. The correct statement asserts that a mosquito transmits dengue by biting an infected person. This highlights the critical role of mosquitoes in the transmission cycle of the disease.

Additionally, dengue has been expanding geographically and is now reported in areas where it was previously absent, such as the southern United States. This geographic expansion is attributed to several factors, including climate change and increased urbanization, which can create favorable conditions for mosquito breeding.

Furthermore, dengue is also endemic in Puerto Rico, where the disease occurs regularly, highlighting its prevalence in various regions and the need for effective vector control measures.

By recognizing that all these statements are true, it underscores the multifaceted challenges posed by dengue, including its vector biology, spread to new regions, and established presence in areas like Puerto Rico. This comprehensive understanding is essential for environmental health professionals engaged in vector control and disease prevention efforts.