This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

SAN DIEGO — Twelve new cases of influenza-like illnesses among undocumented immigrants have been reported at a local shelter, county health officials said Tuesday.

That brings the number of immigrants displaying symptoms at a downtown shelter to 47 since dozens began arriving daily last week from a federal facility in McAllen, Texas. Fourteen families — 15 people in all — remain quarantined at various hotels in San Diego.

Federal officials shut down the Texas facility for cleaning after the outbreak and began moving the detainees to San Diego.

The first of those transfers arrived in San Diego on May 19. To date, nearly 300 people at a migrant shelter in Bankers Hill operated by Jewish Family Service of San Diego have received a health screening.

The number of new cases is the largest since Friday, when health officials confirmed 13 new flu cases at the shelter. The county confirmed two cases on Saturday, one on Sunday and three on Monday.

DHS officials and U.S. Customs and Border Protection announced the plan to begin flying detained asylum seekers from Texas to San Diego on May 17. Federal immigration authorities are operating 10 jets between San Diego and Texas, with roughly 130 people aboard each flight. DHS officials said they aim to charter three flights a week to San Diego International Airport, from which the asylum seekers will be moved to local CBP processing stations like Brown Field.

The transportation is necessary, according to federal immigration authorities, because CBP facilities are largely overwhelmed with new detainees, many of them families and children requesting asylum. CBP agents have detained an average of 4,500 migrants at the border each day this year.

The agency is currently holding about 8,000 people at its detention facility in McAllen, Texas, two times the agency’s maximum capacity in the area. CBP agents temporarily closed processing operations at the facility last week among a flu outbreak of its own, which resulted in the death of a 16- year-old Guatemalan boy. Roughly three dozen immigrants and asylum seekers at the facility are currently quarantined, the Washington Post reported.

San Diego County health officials define a flu outbreak as one person being diagnosed with the virus and a second person contracting and developing the disease within 72 hours. The county said it plans to continue monitoring the situation and providing updates on new flu cases at the shelter.