Coming Flu, by J. L. Greger
When a mysterious flu breaks out in La Bendita, an upscale gated community near the Rio Grande, the lives of its residents change radically --and instantly. The few who are lucky enough to avoid the killer flu become virtual prisoners in their homes when a quarantine is imposed.
One resident, Sara Almquist, a medical epidemiologist, is compelled by habit and training to examine the elements of the epidemic, even when it means she pries into her neighbors’ lives. Sara finds promising clues--maybe too many.