Possible Clues:

• Infectious disease mother's keeping quiet
• One of the M's in the MMRV vaccine
• Viral disease with swellings
• Infectious childhood disease
• Mothers keeping quiet -- it's infectious
• Illness old woman's keeping quiet
• Childhood ailment, typically
• Hesitation from Speaker over politician's illness
• Swollen glands cause
• Not-so-swell swelling