alexa Isolation of a type 3 vaccine-derived poliovirus (VDPV) from an Iranian child with X-linked agammaglobulinemia.


Journal of Vaccines & Vaccination

Author(s): Shahmahmoodi S, Parvaneh N, Burns C, Asghar H, Mamishi S,

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Abstract Type 3 immunodeficiency-associated vaccine-derived polioviruses (iVDPVs) were isolated from a 15-month-old Iranian boy with acute flaccid paralysis (AFP) who was subsequently diagnosed with X-linked agammaglobulinemia (XLA). VP1 nucleotide sequences of the two isolates differed from Sabin 3 by 2.0\% and 2.1\% and from each other by 0.6\%. Although the key determinant of attenuation and temperature sensitivity in the 5'-untranslated region (U(472)-->C) had reverted, a second capsid-region determinant (VP3:Phe(091)) was unchanged, but a presumptive suppressor (VP1:Ala(054)-->Val) was found. The isolates were Sabin 3/Sabin 1 recombinants, sharing a single recombination breakpoint in the 2C region. Although the two isolates were antigenically distinct from Sabin 3, only one amino acid replacement was found in the neutralizing antigenic sites (VP3:Ser(059)-->Asn in site 3). The patient was placed on intravenous immunoglobulin (IVIG) therapy within 9 days of onset of AFP, and iVDPV excretion ceased thereafter, but the patient remained severely paralyzed until his death approximately 11 months after paralysis. No secondary AFP cases were found, and none of the seven tested contacts of the patient were found to be infected with poliovirus. This article was published in Virus Res and referenced in Journal of Vaccines & Vaccination

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