The US healthcare company claimed to have identified a new subtype of the human immunodeficiency virus (HIV), saying their discovery shows researchers being at the forefront of genome sequencing. Is helping to prevent mutations in genes. The Abbott laboratory said on Thursday that three of the blood samples taken between the 1980s and 2001 were found to have subtype 'L' of HIV-1 group M. According to the guidelines issued in the year 2000, for the declaration of a new subtype, three cases should be known separately. Group M is the most common form of HIV-1 virus. Subtype L is the 10th of this group and the first subtype to be identified since the guidelines were issued.