"At the start of the chain, the infectious entity (e.g. virus) lies and replicates in a natural reservoir; this may be an organism or somewhere in the environment (e.g. a lake or the soil). By some means, the infective agent leaves its reservoir via a portal of exit, and employing a mode of transmission, passes through a portal of entry to reach its host 1."
"At the start of the chain, the infectious entity (e.g. virus) lies and replicates in a natural reservoir; this may be an organism or somewhere in the environment (e.g. a lake or the soil). By some means, the infective agent leaves its reservoir via a portal of exit, and employing a mode of transmission, passes through a portal of entry to reach its host 1."
"At the start of the chain, the infectious entity (e.g. virus) lies and replicates in a natural reservoir; this may be an organism or somewhere in the environment (e.g. a lake or the soil). By some means, the infective agent leaves its reservoir via a portal of exit, and employing a mode of transmission, passes through a portal of entry to reach its host 1."
"At the start of the chain, the infectious entity (e.g. virus) lies and replicates in a natural reservoir; this may be an organism or somewhere in the environment (e.g. a lake or the soil). By some means, the infective agent leaves its reservoir via a portal of exit, and employing a mode of transmission, passes through a portal of entry to reach its host 1."
"At the start of the chain, the infectious entity (e.g. virus) lies and replicates in a natural reservoir; this may be an organism or somewhere in the environment (e.g. a lake or the soil). By some means, the infective agent leaves its reservoir via a portal of exit, and employing a mode of transmission, passes through a portal of entry to reach its host 1."
Expected headings
"Clinical significance"
"At the start of the chain, the infectious entity (e.g. virus) lies and replicates in a natural reservoir; this may be an organism or somewhere in the environment (e.g. a lake or the soil). By some means, the infective agent leaves its reservoir via a portal of exit, and employing a mode of transmission, passes through a portal of entry to reach its host 1."