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Copyright ©The Author(s) 2023.
World J Clin Cases. Feb 26, 2023; 11(6): 1252-1260
Published online Feb 26, 2023. doi: 10.12998/wjcc.v11.i6.1252
Table 1 Various diagnostic tests are used in identifying Orthopoxvirus
Test
Definition
Pros
Cons
RT-PCRChecks for the existence of DNA markers unique to mpoxCan provide a diagnosis of an active case utilizing a patient's lesion material. Viral DNA is used in the procedure and can remain stable if the material is stored in a cold, dark environment. Specifically made to target the mpox virusExtremely sensitive tests where contamination risks are considered high. The tools and materials needed for these tests are costly. Must be carried out by trained professionals at a reputable laboratory
Viral culture/isolationLive virus is grown from a patient specimenCan produce a pure, live viral culture that will allow for accurate species categorization. Since viremia is not always present during sickness, patient samples from lesions are the most accurate for this approachIt takes many days to finish the test. Attempts to cultivate patient specimens may be hampered by the presence of bacteria. For viral identification, more classification is required. Must be carried out by trained professionals at a reputable laboratory
Tetracore Orthopox BioThreat AlertTests to see whether Orthopoxvirus antigens are presentA point-of-care diagnostic tool that may quickly diagnose an active case utilizing patient-provided lesion material. Can be done with minimal experience at room temperatureThe mpox virus cannot be detected with this technique. Tests must be conducted in endemic areas. Less accurate than PCR
Electron microscopyA distinct picture of a brick-shaped particle is produced by negative staining, enabling visual identification of a poxvirus and other particlesCan be used to locate viral components in a biopsy specimen, scab material, vesicular fluid, or viral culture. Can distinguish between a herpesvirus and an OrthopoxvirusOrthopoxviruses have morphological similarities to one another. Must be carried out in a reputable laboratory with qualified personnel and an electron microscope
Immunohisto - chemistryTests to see whether Orthopoxvirus-specific antigens are presentAntigens in biopsy specimens can be found with this method. This method can be applied to eliminate or locate more suspicious agentsNot unique to the mpox virus. Must be carried out by trained professionals at a notable laboratory
Anti-Orthopoxvirus IgMTests for the presence of Orthopoxvirus antibodiesCan be used to evaluate recent Orthopoxvirus exposure, either from a disease or a smallpox vaccine. Patients with a history of smallpox vaccination who are suspected of having the Orthopoxvirus may utilize this assay as a diagnosisUtilizes a cold chain and blood (serum) collection. The mpox virus cannot be detected with this technique. Must be carried out by trained professionals at a reputable laboratory
Anti-Orthopoxvirus IgGTests for the presence of Orthopoxvirus antibodiesCan be used to determine whether a disease or smallpox vaccine has previously exposed a person to an OrthopoxvirusNecessitates a cold chain and the collection of blood (serum). The mpox virus cannot be detected with this technique. Previous smallpox immunization will have an impact on the results. Variable response times apply. Must be carried out by trained professionals at a reputable laboratory