FOTOS: Médicos que atienden a migrantes

In this Oct. 26, 2019, photo, University of California San Diego medical student Phil Canete, center, addresses a group of volunteer health practitioners from Mexico and the United States before heading out to set up clinics at shelters for migrants in Tijuana, Mexico. A burgeoning grassroots movement of health professionals and medical students from both sides of the U.S.-Mexico border is quietly battling on the front lines to keep asylum seekers healthy and safe. It is a daunting task taken on by volunteers trying to desperately tend to a need left largely unmet by the governments of both countries. (AP Photo/Gregory Bull)  (ASSOCIATED PRESS)

In this Dec. 14, 2019, photo, Dr. Psyche Calderon works with a patient in a shelter for migrants in Tijuana, Mexico. Calderon is a general practitioner volunteering her time to provide care for Central Americans stuck in Mexico while they try to obtain asylum in the United States. (AP Photo/Gregory Bull)  (ASSOCIATED PRESS)

In this Dec. 14, 2019, photo, Dr. Psyche Calderon works with a patient in a shelter for migrants in Tijuana, Mexico. Calderon is a general practitioner volunteering her time to provide care for Central Americans stuck in Mexico while they try to obtain asylum in the United States. (AP Photo/Gregory Bull)  (ASSOCIATED PRESS)

In this Dec. 14, 2019, photo, Dr. Psyche Calderon works with a patient in a shelter for migrants in Tijuana, Mexico. Calderon is a general practitioner volunteering her time to provide care for Central Americans stuck in Mexico while they try to obtain asylum in the United States. (AP Photo/Gregory Bull)  (ASSOCIATED PRESS)

In this Oct. 26, 2019, photo, dentist Demetrio Cardenas, left, checks inside the mouth of a patient in a shelter for migrants in Tijuana, Mexico. The health crisis spans both sides of the border. In the past year, at least three children, detained by U.S. Border Patrol agents, have died from the flu while being held. They include a 16-year-old boy who was seen on security footage writhing in agony on the floor in a U.S. Border Patrol holding cell. (AP Photo/Gregory Bull)  (ASSOCIATED PRESS)

In this Oct. 26, 2019, photo, a woman waits by the door as volunteer health practitioners set up a clinic in a shelter for migrants in Tijuana, Mexico. A burgeoning grassroots movement of health professionals and medical students from both sides of the U.S.-Mexico border is quietly battling on the front lines to keep asylum seekers healthy and safe. It is a daunting task taken on by volunteers trying to desperately tend to a need left largely unmet by the governments of both countries. (AP Photo/Gregory Bull)  (ASSOCIATED PRESS)

In this Dec. 14, 2019, photo, Psyche Calderon, center, leads other volunteer health care professionals on their way to a shelter for migrants in Tijuana, Mexico. In Tijuana, volunteers like Calderon have been going out to gritty, far-flung neighborhoods to set up pop-up clinics on the weekends at shelters that are rarely visited by Mexico’s public health doctors, if at all. (AP Photo/Gregory Bull)  (ASSOCIATED PRESS)

In this Oct. 26, 2019, photo, pediatrician Paulina Avendano jokes with a girl as she asks her to open her mouth wide during an examination at a shelter for migrants in Tijuana, Mexico. The health crisis spans both sides of the border. In the past year, at least three children, detained by U.S. Border Patrol agents, have died from the flu while being held. They include a 16-year-old boy who was seen on security footage writhing in agony on the floor in a U.S. Border Patrol holding cell. (AP Photo/Gregory Bull)  (ASSOCIATED PRESS)

In this Dec. 14, 2019, photo, Psyche Calderon, center, pauses for a moment as she works alongside other volunteer health care professionals in a shelter for migrants in Tijuana, Mexico. A burgeoning grassroots movement of health professionals and medical students from both sides of the U.S.-Mexico border is quietly battling on the front lines to keep asylum seekers healthy and safe. It is a daunting task taken on by volunteers trying to desperately tend to a need left largely unmet by the governments of both countries. (AP Photo/Gregory Bull)  (ASSOCIATED PRESS)