To add to this, how many virions are needed for a successful replication to start depends on the virus. https://www.virology.ws/2011/01/21/are-all-virus-partic

To add to this, how many virions are needed for a successful replication to start depends on the virus. https://www.virology.ws/2011/01/21/are-all-virus-particles-infectious/ https://www.virology.ws/2011/01/21/are-all-virus-particles-i...