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Characterisation of two different types of poliovirus isolated from a patient
1National Institute for Virology, University of the Witwatersrand Medical School, Johannesburg, Republic of South Africa.
Abstract:
A clinical case of paralytic poliomyelitis with almost simultaneous isolation of two different types of poliovirus was investigated. A strain of poliovirus type I was isolated from the cerebrospinal fluid and a type 3 strain of poliovirus was isolated from the patient's faeces. Both strains were characterised by two-dimensional oligonucleotide mapping. The type I virus was shown to be of wild type while the type 3 virus was shown to be vaccine-associated.
Insights
This study investigated paralytic poliomyelitis, finding both wild-type poliovirus type I and vaccine-associated poliovirus type 3 in a single patient. This highlights the complex interplay of poliovirus strains during infection.
Area of Science:
- Virology
- Clinical Medicine
- Epidemiology
Background:
- Poliomyelitis remains a significant public health concern, primarily caused by poliovirus.
- Understanding the genetic characteristics and origins of circulating poliovirus strains is crucial for effective disease control.
Observation:
- A clinical case of paralytic poliomyelitis presented with simultaneous isolation of two distinct poliovirus types.
- Poliovirus type I was identified in the cerebrospinal fluid, indicating central nervous system involvement.
- Poliovirus type 3 was isolated from fecal samples, suggesting intestinal shedding.
Findings:
- Two-dimensional oligonucleotide mapping revealed distinct genetic profiles for the isolated poliovirus strains.
- The poliovirus type I strain was characterized as wild-type, consistent with naturally circulating strains.
- The poliovirus type 3 strain was identified as vaccine-associated, suggesting a potential link to oral poliovirus vaccine (OPV) use.
Implications:
- This case underscores the potential for co-infection with different poliovirus types, including wild and vaccine-derived strains.
- Simultaneous detection of wild and vaccine-associated poliovirus highlights the importance of continued surveillance and genetic characterization.
- Findings may inform strategies for polio eradication, particularly in regions with ongoing OPV use or potential for wild poliovirus reintroduction.