Hi dvwinner11,
No, it is NOT true!!!
You should read the instructions about Vaccines and Medical Examinations on the USCIS website and from CDC for immigration. Some vaccines are not required at all (such as Hep A, B, and so forth, read the instructions) depending on your age and unless you are at high risk for exposure towards certain diseases (travelers, health care workers, certain age groups, etc.). However, you must have MMR, TDaP (or TD in certain cases), Varicella (chicken pox), and Flu Shot (during flu season November through March). Even if you decide to get the rest of the shots (which is good for you), you do NOT have to complete the series for the sake of AOS (this info is in the instructions). You should call a few Civil Surgeons in your area and ask what shots are required, they will mostly tell you only MMR and TDap or TD is required, and ask you if you had chicken pox as a child, anything else is a rip-off. As an adult, you do not have to get all the vaccines (except for reasons mentioned above, again refer to CDC). I have posted the link to CDC and USCIS for info on this issue, there are many topics, you can skim through and educate yourself about it:
http://www.cdc.gov/immigrantrefugee...vaccination-immigration-faq.html#whatvaccines
http://www.uscis.gov/portal/site/us...nnel=6abe6d26d17df110VgnVCM1000004718190aRCRD
Also, please include your case details in your signature (your case number, field office, when NL1 was received and so on). That way, it will be easier for us to give you better advice.
Good Luck!