The difference of subcutaneous and intradermal injection?

First, different methods

1. Subcutaneous injection: inject the liquid medicine into the subcutaneous tissue.

2, intradermal injection: the drug is injected into the skin below the epidermis.

Two, different location

1, subcutaneous injection: the commonly used injection site is the upper arm and lateral thigh.

2, intradermal injection: generally above the dermis, less than the subcutaneous tissue.

As of February 25, 2021, 4 COVID-19 vaccines had been conditionally listed in China, including three inactivated vaccines and one adenoviral vector vaccine [72]. By 24:00 on March 27, more than 100 million doses of COVID-19 vaccine had been reported in China [76]. In April, experts from the Chinese Center for Disease Control and Prevention said that the proportion of people allergic to the novel coronavirus vaccine is not high, and people with "allergic constitution" and those who are planning to become pregnant can be vaccinated [78]. It was reported on April 12 that China may need 1 billion people to be vaccinated to build an immune barrier [79]. On May 7, China Sinopharm COVID-19 vaccine was certified by WHO for emergency use [83]. On June 1, Xinhua News Agency reported that Sinovac COVID-19 vaccine was authorized by WHO for emergency use [96]. The World Health Organization (WHO) has declared China's Sinovac COVID-19 vaccine on its "emergency use list". [98] By the end of 2021, a total of 2835.33 million doses of novel coronavirus vaccine had been reported in China.

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