A Mexico City toddler who became the first swine-flu death on U.S. soil spent a day shopping at a huge indoor mall in Houston one day before he began to show symptoms.

Cameron County Judge Carlos Cascos, who interviewed members of the Brownsville family with whom the toddler was staying, said they spent three nights in Houston just before he fell ill.

The hospital and health officials on Wednesday said the 23-month old boy had traveled from Mexico City to Brownsville, where he became sick and was medically transported to Texas Children's Hospital. They said he had had no outside contact. The family has shown no symptoms.