protected were now exposed. School closures were shown to reduce morbidity from the Asian flu by 90% during the 1957–1958 pandemic, and up to 50% in controlling influenza in the U.S., 2004–2008. Similarly, mandatory school closures and other social distancing measures were associated with a 29% to 37% reduction in influenza transmission rates during the 2009 flu epidemic in Mexico. The 2009 swine flu pandemic caused social distancing to rise in popularity, most notably in Mexico, with the country's Ministry of Health advising people to avoid handshakes and kissing as ways of greeting people. A mandatory nationwide school closure enacted in Mexico, which lasted for 18 days from late April 2009 to early May 2009, was a form of social distancing aimed at reducing the transmission of Swine flu. A study from 2011 found the mandatory nationwide school closure and other forms of social distancing in Mexico were effective at reducing influenza transmission rates. During the swine flu outbreak in 2009 in the UK, in an article titled "Closure of schools during an influenza pandemic" published in The Lancet Infectious Diseases, a group of epidemiologists endorsed the closure of schools to interrupt the course of the infection, slow the further spread and buy time to research and produce a vaccine. Having studied previous influenza pandemics including the 1918 flu pandemic, the influenza pandemic of 1957 and the 1968 flu pandemic, they reported on the economic and workforce effect school closure would have, particularly with a large percentage of doctors and nurses being women, of whom half had children under the age of 16. They also looked at the dynamics of the spread of influenza in France during French school holidays and noted that cases of flu dropped when schools closed and re-emerged when they re-opened. They noted that when teachers in Israel went on strike during the flu season of 1999–2000, visits to doctors and the number of respiratory infections dropped by more than a fifth and more than two fifths respectively. SARS 2003 During the SARS outbreak of 2003, social distancing measures were implemented, such as banning large gatherings, closing schools and theaters, and other public places, supplemented public health measures such as finding and isolating affected people, quarantining their close contacts, and infection control procedures. This was combined with the wearing of masks for certain people. During this time in Canada, "community quarantine" was used to reduce transmission