While the nonprofit Sesame Workshop says it lacks the resources to sue every street-walking Elmo imposter, Elmo suits are scarce.

WSJ: Getting Into a Character

In one widely reported case last June, a man dressed as Elmo from "Sesame Street" shouted an anti-Semitic rant before being taken into police custody.

WSJ: Street Characters Tread Fuzzy Legal Ground

To help combat the spread of the virus among young children, the Department of Health and Human Services announced Wednesday that it is re-releasing a series of public service announcements featuring the popular Sesame Street character Elmo.

CNN: Use 'common-sense' steps against H1N1 virus, Obama says