From the NY Times:
“This is just not the right flu season to take this on,” said Dr. Frieden, who previously was the New York City health commissioner.[He was responding to questions about mandatory flu vaccinations--Nass]
…Over all, virologists say, of every 100 people who faithfully get flu shots, only about 70 are fully protected every year. But even the other 30 are partly protected by previous shots and by “herd immunity” — the fewer unprotected victims a virus finds, the faster it fades out.