The operative word seems to be
if.
"If they should become infected when older, chicken pox can cause serious complications, in particular, pneumonia sometimes requiring hospitalization."The CDC have this to say about it in their FAQ on varicella vaccine:
How long does the vaccine protect someone against chickenpox? Will a booster vaccination be needed?
The length of protection/immunity from any new vaccine is never known when it is first introduced. However, available information collected from persons vaccinated in Japan and the United States show that protection has lasted for as long as the vaccinated persons have been followed (25 years in Japan and more than 10 years in the U.S.). Follow up studies to determine how long protection will last and to evaluate the need and timing for booster vaccination, are ongoing. If it is determined in the future that a booster dose is necessary, your health care provider will inform you. Currently, no booster dose is recommended.Edit:
http://www.cdc.gov/nip/vaccine/varicella/faqs-gen-vaccine.htm#8-effective
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