Intranasal immunization

Influenza Immunization Among Chinese Seniors: Urgent Calling For Improving Vaccination Coverage, Education, And Research

AGING MEDICINE
Volume 3, Issue 1

Li, Xin; Leng, Sean X.

Background

It is with great pleasure that we provide this commentary with a focus on influenza vaccination for an expert consensus entitled “Recommendations for influenza and Streptococcus pneumoniae vaccination in elderly people in China” to be published in this issue of Aging Medicine. Influenza is a major global public health burden with pandemic threat. Seasonal influenza infection is responsible for 3‐5 million severe illness cases and 290 000‐650 000 respiratory deaths annually worldwide.  According to the Centers for Disease Control and Prevention (CDC), influenza affects 5%‐20% of the population each year in the United States. It is estimated that influenza causes 226 000 excess hospitalizations, 25 000‐69 000 deaths, and US $87 billion excess health‐care cost with over 600 000 life‐years lost annually. Among all infectious diseases, influenza is foremost in its age‐related increase in serious complications, leading to hospitalization, catastrophic disability, and death in older adults. Moreover, influenza frequently causes exacerbation of many chronic conditions that are common in older adults, including cardiovascular diseases, further indirectly impacting senior health and mortality. In fact, over 90% of influenza‐related mortality occurs in persons aged over 65 years. In the United States, influenza and its secondary pneumonia are the fourth leading cause of death in this population. Therefore, prevention and treatment of influenza in older adults have become a major public health priority.

Keywords

COVID-19, SARS-CoV-2, Treatment

Intranasal immunization with inactivated SARS-CoV (SARS-associated coronavirus) induced local and serum antibodies in mice

Vaccine
Volume 23, Issue 7, 4 January 2005, Pages 924-931

Di Qu, Bojian Zheng, Xin Yao, Yi Guan, Zheng-Hong Yuan, Nan-Shan Zhong, Li-Wei Lu, Jian-Ping Xie, Yu-Mei Wen

Abstract

SARS-CoV (severe acute respiratory syndrome-associated coronavirus) strain GZ50 was partially purified and inactivated with 1:2000 formaldehyde. In cell culture the inactivated virus blocked the replication of live virus by decreasing the TCID5.0 of the live virus 103.6 to 104.6 times. Inactivated GZ50 was used to immunize mice intranasally either alone, or after precipitation with polyethylene glycol (PEG), or with CpG, or CTB as an adjuvant. The titer of serum neutralizing antibodies was up to 1:640. In mice immunized with adjuvants or PEG precipitated GZ50, specific IgA was detected in tracheal-lung wash fluid by immunofluorescence. Though serum antibodies were detected, no anti-SARS-IgA could be detected in mice immunized only with inactivated GZ50. The roles of adjuvants in intranasal immunization with inactivated. SARS-CoV is discussed.

Keywords

SARS-CoV, Intranasal immunization, Inactivated vaccine