0
We're unable to sign you in at this time. Please try again in a few minutes.
Retry
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
Retry
There may be a problem with your account. Please contact the AMA Service Center to resolve this issue.
Contact the AMA Service Center:
Telephone: 1 (800) 262-2350 or 1 (312) 670-7827  *   Email: subscriptions@jamanetwork.com
Error Message ......
Editorial |

Herd Immunity and the Varicella Vaccine:  Is It a Good Thing?

James A. Taylor, MD
Arch Pediatr Adolesc Med. 2001;155(4):440-441. doi:10.1001/archpedi.155.4.440.
Text Size: A A A
Published online

Extract

IN THIS issue of the ARCHIVES, Clements and colleagues1 report on their 5-year cohort study of varicella among children from 11 day care centers in North Carolina. The observation period began shortly prior to licensure of the varicella vaccine in 1995; thus, it was possible to compare the rate of disease in the study population prior to and after initiation of the immunization program, as well as to monitor the increase in the uptake of the vaccine over time. During the study, the incidence of varicella was carefully monitored by both a passive reporting system for parents and day care center personnel and active surveillance conducted by the research team. Based on the data collected, it was estimated that varicella vaccine coverage in the day care centers rose from 4% in early 1995 to 63% by the end of 1999. As might be expected, the rate of varicella disease in immunized children was low—ranging from 5.35 cases per 1000 person-months before July 1996, to 1.01 cases per 1000 person-months in late 1999. However, concurrent with the increased uptake of the vaccine in the day care centers, the rate of disease in unvaccinated children also fell dramatically. Among those not vaccinated, the rate of varicella was 16.74 per 1000 person-months prior to July 1996; by the end of 1999 this rate had decreased to 1.53 per 1000 person-months. The authors conclude that this decrease in varicella in the unvaccinated children is a demonstration of herd immunity and is a welcome effect of the vaccine.

Topics

Sign in

Create a free personal account to sign up for alerts, share articles, and more.

Purchase Options

• Buy this article
• Subscribe to the journal

First Page Preview

View Large
First page PDF preview

Figures

Tables

References

Correspondence

CME
Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.
Submit a Comment

Multimedia

Some tools below are only available to our subscribers or users with an online account.

Web of Science® Times Cited: 3

Sign in

Create a free personal account to sign up for alerts, share articles, and more.

Purchase Options

• Buy this article
• Subscribe to the journal

Related Content

Customize your page view by dragging & repositioning the boxes below.

See Also...
Jobs
brightcove.createExperiences();