This episode discusses four MMWR reports. First, a case of locally acquired malaria in Arkansas in 2023 highlights the importance of preventing diseases spread by mosquitoes. Second, public health officials in California responded to the first locally acquired dengue infections, also transmitted by mosquitoes. Third, private balcony hot tubs are previously unidentified sources of Legionella exposure on cruise ships. Last, JN.1 and its descendants have been the most common SARS-CoV-2 virus variants in 2024, and they're still evolving.