Swine Flu Symptoms 2024. Unlike typical seasonal flu patterns, the new virus caused high levels of summer infections in the northern hemisphere, and then even higher levels of activity during cooler months. The symptoms may start three to five days after exposure to the.
What are the typical symptoms of swine flu? Unlike typical seasonal flu patterns, the new virus caused high levels of summer infections in the northern hemisphere, and then even higher levels of activity during cooler months.