Mexico voiced hope today it might be getting control of an outbreak of a new flu strain that has killed up to 176 people there, shut down large parts of the country and raised fears of a global epidemic, according to Reuters. The U.S. Centers for Disease Control and Prevention said Mexico's outbreak of the new H1N1 swine flu virus may not be as severe as it looked at first, citing many mild cases that were not immediately noticed. Worldwide, 13 countries have confirmed cases. Almost all infections outside Mexico have been mild, and only a handful of patients have required hospital treatment. In Mexico, many offices and businesses were closed for a five-day break to help slow the spread of the disease. The capital's mayor, Marcelo Ebrard, said emergency campaigns against the virus were bringing results. "Individuals and families have been taking these measures very seriously and as a result we have had timely and early detection of cases of respiratory illnesses that could be of this type. This has led us to a situation where the numbers are getting better every day," he said. "I'm not saying we should let our guard down ... I'm telling you so you know where we stand." Mexican public hospitals that treat roughly half the country admitted just 46 patients with severe flu symptoms on Thursday, down from 212 patients on April 20. The latest countries to report new infections were Denmark and Hong Kong -- where authorities sealed off a hotel where a 25-year-old Mexican visitor had been staying. He became the first verified case in Asia.