translation.bg: Симптомите се развиват между 2-10 дни (обикновено за 5-6 дни), но много рядко в някои случаи това може да отнеме 2-3 седмици.
translation.en: It normally takes between two to ten days to develop symptoms (typically five to six days) but very rarely some cases may take two to three weeks to develop symptoms.