Final answer:
The individual likely has a blood type of B-positive or B-negative, since their blood agglutinated with anti-B sera and not with anti-A sera. Agglutination indicates the presence of B antigens. Further testing with anti-Rh serum is needed to determine the Rh factor.
Step-by-step explanation:
If an individual's blood does not agglutinate in anti-A sera but does agglutinate in anti-B sera, the blood type of the individual is most likely B-positive or B-negative. This is because the presence of agglutination in the anti-B serum indicates that the person's red blood cells have B antigens on their surface, which react with the anti-B antibodies. We would need further testing with anti-Rh serum to determine the Rh factor and thus distinguish between B-positive and B-negative.
Normally, an individual with type B blood has pre-formed anti-A antibodies in their plasma, which will agglutinate with A antigens. Agglutination is the clumping of cells in response to an antigen-antibody interaction. Since no agglutination occurred with the anti-A sera, we can deduce that this individual does not have A antigens, thus confirming that they do not have type A, AB, or O blood type.