It’s a particularly exuberant tortoise nicknamed Typhoid Mary, who got the nickname because she harbors a contagious bacteria that causes upper respiratory tract disease.

It can be read, at a very long stretch, as a metaphor for STDs, or a tract against casual sex, the perils of alcohol or, most convincingly, of sex while drunk.

In the 1950s, another terminal disease called quick decline — also known as la tristeza, or “the sadness” — prompted farmers to bulldoze thousands of acres of orchards to make way for tract housing.

For these specific kids, home is At Attin, where they live in neighborhoods with tract housing and lawns, take the bus or their bikes to school and interact with various service droids.

Viral genome sequences indicate the teen was infected with the type of H5N1 typically found in wild birds and that it had mutated to better cleave to the respiratory tract.