For undocumented Mexican migrants in the United States, the threat of the H1N1 flu virus is compounded by a lack of face masks, medicine or other medical assistance, should the need arise.
The flu outbreak has also led some groups in the US to call for tighter border security and an end to illegal migration from Mexico.
But as Al Jazeera's Gabriel Elizondo reports from California, some say such groups are using the virus as an excuse to get tougher on border control.
