The number of house mice infected with H5N1 bird flu at a poultry farm in New Mexico has risen to nearly 50, federal officials disclosed on Tuesday, just a week after bird flu was found in rodents for the first time. The Animal and Plant Health Inspection Service at the U.S. Department of Agriculture reported in its weekly update that another 36 house mice had tested positive for H5N1 in Roosevelt County, New Mexico. The first 11 cases were reported last week though only few details have been released about the outbreak. A weekly report from the World Organization for Animal Health said the fi…