If you make a point of enjoying yourself, your positive attitude will be contagious.
Preschool brains haven't yet fully developed the prefrontal system, and young kids' free-spirited thinking can be contagious.
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But recent seasons have taught Arsenal that those setbacks can be contagious this time of year, spreading from one competition into the next.
The World Bank hopes this new way of doing things will be contagious: if it works in telecoms, it might also succeed in transport.
But transplanting pig cells into people is still controversial, since it brings the risk of transplanting pig diseases (which may be contagious) at the same time.
People overestimated their chances of catching flu and the length of time for which the disease would be contagious, and underestimated the effectiveness and duration of the vaccine.
Encouragingly, reform seems to be contagious.
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Mr. QUAMMEN: Contagious could be any situation in which the cancer cells from one person are passed to another.
Public-health officials were alarmed by the possibility that supposedly healthy people might unknowingly be infected with a contagious retrovirus.
Legionnaires' disease is not contagious and cannot be spread directly from person to person.
However, recent experience in Brazil has shown that contagious effects can be contained after much of the bad news has been discounted.
Hospitals will be overrun with sick highly contagious people whom they cannot help and existing patients needing operations, dialysis or help with complicated childbirth will suffer.
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The highly contagious virus can be spread by contact with contaminated surfaces or objects, contact with a person who has the infection or through contaminated food and water.
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The highly contagious virus can be carried by the wind, on the soles of shoes or on the wheels of cars, and the British countryside has become a virtual no-go area.
And, he stresses, the volume of often useless data generated by social media users during outbreaks of contagious diseases should not be viewed as a problem.
The United States stepped up preparations for a possible swine flu epidemic, and Canada confirmed its first cases on Sunday as researchers worked to determine how contagious the virus could be.
Dr Marion Lyons, director of health protection for Public Health Wales, said measles was a very contagious disease that would be contracted by 90% of unvaccinated people who came into contact with cases.
The advice to parents is clear: the disease, though usually mild, is highly contagious, so children should be kept away from crowded places.
For more than 20 years, the alt-rock duo They Might Be Giants has been playing clever and contagious music for fans of all ages.
The risks of a smallpox vaccination program seem minuscule compared with the devastation that would be wrought from terrorists' introducing the highly contagious virus into our uninoculated population.
Should this profit-taking prove contagious, a move lower could be just what those who have been waiting for an opportunity to add some Facebook to their stock portfolios have been looking for.
Now, we need to be alive to the possibility that international misbehavior is contagious, spreading from insignificant countries to ones of more consequence and from hardline states to terrorist groups.
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"This show of love could be dangerous, " he said, stressing the extremely contagious nature of the virus.
David's enthusiasm was contagious, which made him a delight to be around, especially in sub-zero weather in Iowa or New Hampshire.
These are the sorts of questions we will have to confront as we shift toward more preventative approaches whether it be terrorism, crime in general, the spread of contagious diseases or preventive warfare.
Because the worst thing that could happen would be to have a disease that travelled and was very, very contagious.
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Dr Hussey said whooping cough can be treated successfully with antibiotics and most people make a full recovery, but it is highly contagious.
Scientists say the findings -- to be published in Nature on Thursday -- can help improve public transit systems and even fight contagious diseases.
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