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Answer:
The general stages of the development cycle of a vaccine are:
Exploratory stage
Pre-clinical stage
Clinical development
Regulatory review and approval
Manufacturing
Quality control
Clinical development is a three-phase process. During Phase I, small groups of people receive the trial vaccine. In Phase II, the clinical study is expanded and vaccine is given to people who have characteristics (such as age and physical health) similar to those for whom the new vaccine is intended. In Phase III, the vaccine is given to thousands of people and tested for efficacy and safety.
Many vaccines undergo Phase IV formal, ongoing studies after the vaccine is approved and licensed.
For more information and to find out about new vaccines on the horizon, see the World Health Organization’s (WHO’s) Development of New Vaccinesexternal icon web page.
Vaccine Product Approval Process
Journey of a New Vaccine: From Development to Licensed for Use
See how a new vaccine is developed, approved, manufactured, added to recommended schedule, and is continually monitored.

The U.S. Food and Drug Administration’s (FDA’s) Center for Biologics Evaluation and Researchexternal icon (CBER) is responsible for regulating vaccines in the United States.
The sponsor of a new vaccine product follows a multi-step approval process, which typically includes
An Investigational New Drug application
Pre-licensure vaccine clinical trials
A Biologics License Application (BLA)
Inspection of the manufacturing facility
Presentation of findings to FDA’s Vaccines and Related Biological Products Advisory Committeeexternal icon (VRBPAC)
Usability testing of product labeling
After approving a vaccine, FDA continues to oversee its production to ensure continuing safety. Monitoring of the vaccine and of production activities, including periodic facility inspections, must continue as long as the manufacturer holds a license for the vaccine product.
FDA can require a manufacturer submit the results of their own tests for potency, safety, and purity for each vaccine lot. FDA can require each manufacturer submit samples of each vaccine lot for testing.
To learn about FDA’s role in the vaccine approval process, consult FDA’s Vaccine Product Approval Processexternal icon web page.
Tracking Side Effects Once a Vaccine is Adminstered
The Vaccine Adverse Event Reporting System (VAERS) is a national vaccine safety surveillance program co-sponsored by the Food and Drug Administration (FDA) and the CDC.
VAERS collects and analyzes information from reports of adverse events (side effects) that occur after the administration of US licensed vaccines. Reports are welcome from all concerned individuals: patients, parents, healthcare providers, pharmacists, and vaccine manufacturers. To submit a report, use VAERS’ reporting pageexternal icon.
For more information on VAERS, consult VAERS websiteexternal icon.
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Related Topics and Sources
Vaccine Development, Testing and Regulationexternal icon
Source: History of Vaccines
Vaccine Regulationexternal icon
(World Health Organization)
FDA’s Vaccine Safety & Availabilityexternal icon
Vaccine Adverse Event Reporting Systemexternal icon (VAERS)
CDC’s Vaccine Safety
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Related Page
National Vaccine Advisory Committeeexternal icon (NVAC)
Page last reviewed: May 1, 2014
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