This is an influenza virus particle, also known as a virion, according to the Centers for Disease Control and Prevention. Virions are made up of an outer protein shell and an inner core of nucleic acid: in this case, eight single-stranded RNA segments.
This image depicts a number of influenza A virions. There are three basic types of influenza viruses -- A, B and C -- but only influenza A can infect animals, such as pigs or birds. When a virus strain enters an animal, it may change, causing a more serious epidemic when it returns to humans.