Mexico has confirmed two more deaths from the new H1N1 flu virus, raising the official toll to 44.
The Mexican government says the worst is over.
University students returned to their classes on Thursday. However, many junior schools are still closed until Monday.
Bars, cinemas, restaurants and workplaces have reopened after being closed for five days.
But visitors to government buildings have to wear surgical masks and wash their hands with anti-bacterial soap before entering.
According to the World Health Organization, H1N1 has reached 24 countries and infected more than 2000 people.
Sweden and Poland confirmed their first cases on Wednesday.
The flu has prompted around 20 nations to ban imports of pigs, pork and meat products from Mexico, the United States and Canada.