HIV-1 Western blots of the cases were weakly reactive in contrast to the unequivocally positive Western blots of typical LTNPs/ECs. (A) HIV-1 Western blots with controls performed with serial, including standard (1:100; boxes), dilutions of patient sera from each of the cases C1 to C4 to diluent. (B) HIV-1 Western blots with controls performed with serial, including standard (1:100; box), dilutions of patient serum to diluent from one representative LTNP/EC (left), and at the standard dilution for a subset of typical LTNPs/ECs (right).