Lychko, V.; Kolenko, O. .; Burtyka, M. . DIFFERENTIAL DIAGNOSIS OF EXACERBATIONS AND PSEUDO-EXACERBATIONS AGAINST THE BACKGROUND OF SARS-COV-2 BY THE EXAMPLE OF A CLINICAL CASE OF A PATIENT WITH MULTIPLE SCLEROSIS. East. Ukr. Med. J. 2023, 11, 47-52.