ETYM Latin contagiosus: cf. French contagieux.
Easily diffused or spread as from one person to another.

ETYM Cf. French infectieux.
1. Caused by infection or capable of causing infection; viruses and other infective agents SYN. infective.
2. Easily spread.

ETYM Latin infectivus pertaining to dyeing.
Able to cause disease; SYN. morbific, pathogenic.

Filled with vapor; SYN. miasmic, vaporous.

Of noxious stench from atmospheric pollution; SYN. mephitic.

In a contagious manner; SYN. infectiously.

In an infectious manner