Study to Evaluate the inHaled Recombinant COVID-19 Vaccine (Adenovirus Type 5 Vector) On the Protective-Efficacy in Adults (SeiHOPE)

This phase III clinical trial is an endpoint-driven randomized, double-blind, parallel-controlled, multicenter clinical trial, and around 13,000 subjects aged 18 years and above who have previously received 1 dose of intramuscular Ad5-nCoV will be recruited. Volunteers should have been vaccinated with intramuscular Ad5-nCoV \> 56 days prior to enrollment. All subjects will receive 1 dose of investigational vaccine or placebo through nebulized inhalation. The ratio of subjects in the vaccine group and placebo group is 1:1 and the efficacy and safety of the investigational vaccine will be followed up for 52 weeks after vaccination.


Eligibility Criteria:
Inclusion Criteria:

* Adult volunteers aged 18 years and above who have received 1 dose of intramuscular Ad5-nCoV \> 56 days at the enrollment.
* Volunteers who have provided informed consent and signed the informed consent form.
* Volunteers who are able and willing to comply with the requirements of the clinical study protocol, and can complete the entire follow-up period of this study.

Exclusion Criteria:

* Allergic to the active ingredient, any non-active ingredient, or substances used in the manufacturing process, or developed an allergy to similar vaccines in the past.
* History of severe anaphylactic reaction to vaccines (e.g., acute anaphylactic reactions, angioedema, dyspnea).
* History or family history of seizures, epilepsy, encephalopathy, or psychosis.
* Severe nasal or oral diseases, such as acute rhinitis (sinusitis), allergic rhinitis, oral ulcers, throat redness, and swelling.
* History of a definite diagnosis of COVID-19.
* Positive SARS-CoV-2 N antibody rapid screening kit (IgG and IgM) results.
* Received COVID-19 vaccine other than Ad5-nCoV.
* Axillary temperature \> 37.0°C.
* Severe cardiovascular diseases, such as arrhythmia, conduction block, myocardial infarction, or severe hypertension and cannot be controlled by drugs.
* Lung function abnormalities such as asthma, chronic obstructive pulmonary disease, and pulmonary fibrosis.
* Acute febrile illness, symptoms of upper respiratory tract infection, or infectious diseases.
* Severe chronic diseases, or diseases of the progressive stage that cannot be steadily controlled, such as diabetes or thyroid disorders.
* Asplenia or functional asplenia.
* Thrombocytopenia or other coagulation disorder.
* Received immunosuppressant or immunomodulatory therapy (continuous oral or intravenous infusion for more than 14 days), anti-allergic therapy, cytotoxic therapy within the past 6 months. Inhalational and local steroids are allowed.
* Received blood products within 4 months before receiving the investigational vaccine.
* Received other vaccines within the past 14 days or plan to receive other vaccines 14 days after scheduled immunization with the investigational vaccine.
* Volunteers under antituberculous treatment or with active tuberculosis.
* Received blood/plasma products or immunoglobulin 60 days before immunization with the investigational vaccine or planned to receive blood/plasma products or immunoglobulin during the entire study period.
* Females who are positive for the urine pregnancy test, pregnant, or breastfeeding, or females who plan to conceive within 3 months (urine pregnancy test will only be performed in female volunteers of childbearing age).
* Volunteers who are judged by the investigator with any contradiction to the study protocol or affected the signing of informed consent due to various medical, psychological,social, or other conditions.