But there is more to a cell wall than just peptidoglycan. In nature, there are two major types of cell walls, Gram-positive and Gram-negative, each with very different structures. The term 'Gram' refers to the Gram-staining technique that differentiates bacteria with the two different cell walls.
Although infections from other viruses may have similar symptoms, those due to the influenza virus tend to be worse. Symptoms can begin about 1 to 4 days, or an average of 2 days, after a person is first exposed to the influenza virus.Fever and other symptoms can usually last up to 7 to 10 days, but the cough and weakness may last 1 to 2 weeks longer.If you get sick with influenza, home treatment can help ease symptoms.lthough infections from other viruses may have similar symptoms, those due to the influenza virus tend to be worse. Symptoms can begin about 1 to 4 days, or an average of 2 days, after a person is first exposed to the influenza virus.
Sometimes (though, less often) a person can even catch the flu by touching a surface or object that has the flu virus on it, and then afterward touching their own mouth, eyes, or nose. How long does the flu last? As harsh as the flu can be, the good news is that most people feel much better within one to two weeks. Most healthy adults become contagious the day before symptoms develop (which makes it trickier to prevent from spreading). They remain infectious for up to five to seven days after symptoms appear.