Recurrence of COVID-19 infection symptoms in short time; reinfection or reactivation? Three cases of three healthcare workers and a literature review.

Background: Since the beginning of the COVID-19 pandemic, many research papers have been published focusing on some recurrence cases of symptoms after a long period of free symptoms with a negative RT-PCR retest. There is no crucial evidence until now of the possibility of recurrence, immune system reactivation, or reinfection.

Methods: Three cases of resident doctors who recovered from COVID-19 but represented symptoms with new positive RT-PCR were discussed.

Correlation of Pattern Reversal and Flash Visual Evoked Potential Latencies With Optical Coherence Tomography Measures in Patients With Optic Neuropathy and Patients With Multiple Sclerosis Without Optic Neuropathy.

Purpose: The object of the study is to relate the pattern reversal visual evoked potential (PRVEP) and flash VEP (f-VEP) latencies with retinal neurons and their fibers.

Methods: We studied 104 eyes. Forty-two eyes from patients with optic neuritis (ON), 28 eyes from patients with multiple sclerosis without involvement of the optic nerves (MS-non-ON), and 34 eyes of normal controls.