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Enteroviral capsid protein 1 in the stomach biopsy of an ME/CFS patient by immunoperoxidase staining (100×) (Chia et al., 2015). This type of chronic viral infection is difficult to identify without the use of special techniques such as antibody staining or nucleic acid amplification of biopsies taken from symptomatic areas, since viral cultures are rarely positive. Original image courtesy of Dr. John Chia.
