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1. Of or relating to contagion.
2. Transmissible by direct or indirect contact; communicable: a contagious disease.
3. Capable of transmitting a disease: stayed at home until he was no longer contagious.
4. Spreading or tending to spread from one to another; infectious: a contagious smile.

con·ta′gious·ly adv.
con·ta′gious·ness n.
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References in periodicals archive ?
Authorities said the H5N6 strain which broke out at duck farms has similar levels of contagiousness and pathogenicity as the H5N1 type which wreaked the greatest scale of damage last year.
HHV reactivation, rather than primary infection, is more likely the cause of PR as supported by sporadic occurrence of PR, reduced contagiousness, age of PR onset, possible relapse during a limited span of time, and frequent occurrence after stress or immunosuppressive states such as pregnancy," Dr.
Effect of "pink eye" label on parents' intent to use antibiotics and perceived contagiousness.
Its contagiousness varies with the relative activity of and gender relationships between friends.
I wholeheartedly believe in the contagiousness of action," he says.
2) The world's population is headed toward 11 billion or more by the end of the century (3) in the absence of nuclear war or collision with a large asteroid or the discovery by nihilists of how to combine the lethality of Ebola with the contagiousness of the common cold.
The unfavorable outcome in these TB patients with prolonged poorly controlled DM poses the risk of extended period of contagiousness and may transmit mycobacteria to their contacts for a longer period, both before the diagnosis and after the initiation of treatment.
Social taboos of spreading disease via trucut biopsy and if the mother is a breast cancer patient her daughter will get the disease and about breast cancer contagiousness are all misleading, invalid and insignificant.
int/csr/disease/smallpox/lethalinfection/en/ ("Smallpox virus is acknowledged to pose a significant threat as a bioterrorist weapon because of its contagiousness and the absence of effective antiviral drugs.
The outbreak affected more than 3 million hectares of wheat and due to its contagiousness, the infectious disease significantly reduced the potential for wheat production in the South American region, including Argentina, Paraguay, Colombia, Chile and Bolivia.
These biomarkersmeasurable indicators of the severity or presence of some disease statemight help researchers predict the onset of contagiousness.