A person breathes in droplets containing an influenza virus. The virus particles enter cells lining the person's respiratory tract and use these cells to make more virus particles.
Which is the pathogen in this infection?
the droplets breathed in by the person
the influenza virus particles
the respiratory tract cells
the person with influenza
112 exam-style questions on Edexcel GCSE Biology 5.1 Health and communicable disease, covering 5.1.1 Communicable and non-communicable diseases, 5.1.2 Disease susceptibility interactions, 5.1.3 Pathogens as disease-causing organisms, 5.1.4 Common infections, 5.1.5 Spread and prevention of pathogens, 5.1.6 Lifecycle of a virus, and 5.1.7 Spread and prevention of STIs. Each one has a worked solution and a mark scheme showing where the marks go.