Polls show a close race between the eight candidates for the single-round May 5 vote. AS/COA Online looks at who’s leading.

Dr. Mariângela Simão assesses the region’s preparedness in the face of a major dengue outbreak in Argentina, Brazil, and other countries.

Learn about Claudia Sheinbaum, Xóchitl Gálvez, and Jorge Álvarez Máynez—the three rivals competing to succeed Andrés Manuel López Obrador.