Retrograde infection
Encyclopedia
Retrograde is defined as "In reverse action", therefore a retrograde infection is an infection
Infection
An infection is the colonization of a host organism by parasite species. Infecting parasites seek to use the host's resources to reproduce, often resulting in disease...

 that enters or spreads through the body through a means that is usually considered backwards. An example is spreading into the salivary glands through the saliva ducts
Salivary duct
Salivary duct may refer to:* Parotid duct* Submaxillary duct* Major sublingual duct...

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