MEXICALI, Mexico/EL CENTRO, Calif., (Reuters) – Coronavirus cases are surging in a scorching hot desert region straddling south California and a city near Mexico’s Tijuana, leading to saturated hospitals, a cross-border overspill of patients and airlifts from rural U.S. clinics. Mexicali, capital of the Mexican state of Baja California, has the third-highest number of confirmed COVID cases in Mexico, with its main hospitals at four-fifths capacity, state health department data shows.