Homozygosity for a 32-bp deletion in the CCR5 allele provides resistance against HIV-1 acquisition. June 11, 2012 Jh http://www.nejm.org/doi/full/10.1056/NEJMoa0802905 =) No I probably do not have the mutation. Homozygosity for a 32-bp deletion in the CCR5 allele provides resistance against HIV-1 acquisition.