A new strain of the swine flu virus has been discovered by Brazilian scientists.
The scientists uncovered the new strain after examining samples from a patient who was hospitalized in Sao Paulo in April, Agence France-Presse reported.
The 26-year-old, who developed flu symptoms after returning from Mexico, has since made a full recovery.
The variant has been called A/Sao Paulo/1454/H1N1 by the Adolfo Lutz Bacteriological Institute, which compared it with samples of the H1N1 swine flu from California
It was not yet known whether the new strain causes more severe infections than the current H1N1 strain, which has been declared a global pandemic by the World Health Organization.
Nearly 36,000 people in 76 countries have been infected with the H1N1 virus, according to the latest figures from the WHO, causing more than160 deaths.