Influenza Clinical Trial
Official title:
Phase 4 Study of Post-License Safety Evaluation of Influenza Split Vaccine
To evaluate the safety of the post-licensed influenza virus vaccine made of Changchun Institute of Biological Products Co.,Ltd.
In order to evaluate the safety of the post-licensed influenza vaccine (the vaccine is
manufactured by Changchun Institute of Biological Products Co.,Ltd in China),
retrospectively collect the AEFI cases reported from national AEFI surveillance system in
Sichuan province of China in 2013, compare the incidence and proportion of local and general
reactions, with other influenza vaccine.
Adverse events were collected through the National Immunization Information System's
National Adverse Events Following Immunization (AEFI) Surveillance System, which was
established in 2005 on the basis of World Health Organization (WHO) guidelines. According to
the Guideline for the Identification of Adverse Reaction after Immunization issued by the
Chinese Ministry of Health in 2008, Sichuan CDC and local prefectural CDC must organize an
expert panel to investigate adverse events and assess causality, using criteria based on
Chinese Standard Procedures for Vaccination.
At the time of vaccination, vaccinees were instructed to report any adverse event to
physicians or vaccination providers. Adverse events that were fatal or that resulted in
disability and clusters of events (i.e., notably high numbers of similar adverse events
related to a certain vaccine) were required to be reported within 2 hours after their
occurrence. The following adverse events were required to be reported within 2 days after
their occurrence: anaphylaxis or other allergic reactions occurring within 24 hours after
vaccination; fever (axillary temperature, >37.5°C), angioedema, or a local injection-site
reaction (diameter, >2.5 cm) occurring within 5 days after vaccination; purpura, an Arthus
reaction, febrile convulsion, seizure, or polyneuritis occurring within 15 days after
vaccination; and the Guillain-Barré syndrome occurring within 3 months after vaccination.
Other reactions that were common and minor (e.g., mild pain and fatigue) were not required
to be reported.
;
Observational Model: Case-Only, Time Perspective: Retrospective
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