Quiz As per WHO guidelines, after showing COVID-19 symptoms one has to isolate for how many days? Mukesh Sharma - May 20, 2021 0 Options to the question – As per WHO guidelines, after showing COVID-19 symptoms one has to isolate for how many days? 18 5 14 2 The correct answer is 14. As per WHO guidelines, after showing COVID-19 symptoms one has to isolate for 14 days.