Investors are getting a big booster shot of income to a portfolio without having to compromise credit quality.

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In 2005, a booster shot called Tdap was introduced for adolescents and adults that inoculates against tetanus, diphtheria and pertussis.

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The outbreak lead to a requirement that at age 10, before entering the seventh grade, kids must have a Pertussis booster shot.

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Commodity markets, including the precious metals, were given a booster shot Monday morning when Federal Reserve Chairman Ben Bernanke ostensibly put another quantitative easing package back on the table.

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Since the pertussis vaccine's protection can wear off with time, a booster shot is recommended for adolescents at their 11-year-old checkup visit, as well as for adults who care for young infants, in order to protect from whooping cough until the babies have their own immunity.

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Serum has no assured orders for the vaccine from the government so far, but billionaire Cyrus Poonawalla, who owns the firm, which is located in Pune, has decided to set up a manufacturing facility in anticipation of future demand--and, hopefully, windfall profits (See "Booster Shot").

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Experiments in monkeys suggest that an AIDS vaccine developed by Merck (nyse: MRK - news - people ) may work better when a vaccine invented by Aventis (nyse: AVE - news - people ) is used as a booster shot.

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The word is going out that a lot of people need to get a pertussis booster shot Pertussis, more commonly known as whooping cough, is a bacterial infection that is very dangerous and sometimes fatal in young infants, whose immune systems are too immature to protect them.

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In 2009 NASA shot a Centaur rocket booster into the moon, kicking up 350 tons of debris that spewed up six miles high.

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