It is possible to go 14 days without developing illness after a delta virus infection, and the incubation period is usually about 1 to 14 days. The incubation period of delta virus is about 1 to 14 days after infection, and most infected persons develop the disease within 3 to 7 days, with an average of about 4.4 days. Delta virus strains have higher viral loads and shorter onset times than the original strains, but there have been reports of up to 20 days of incubation after infection, so it cannot be ruled out that a small number of people do not develop the disease for more than 14 days. Symptoms of delta virus infection are more atypical than those of the original Neocollin strain, and may include decreased or loss of smell and taste, or muscle aches, diarrhea, fatigue, and sore throat, which need to be confirmed by a complete nucleic acid test for Neocollin virus. Nucleic acid conversion takes longer due to the higher viral load after delta virus infection.