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71results about How to "Effective immunity" patented technology

Preparation method and application of recombinant cold-adaptation attenuated influenza vaccine strain

The invention discloses a preparation method and an application of a recombinant cold-adaptation attenuated influenza vaccine strain. The method comprises the following steps: importing an influenza virus hemagglutinin HA gene, an influenza virus neuraminidase NA gene as well as seven genes, namely PB2, PB1, PA, NP, M, NS1 and NS2, in an influenza virus to a host cell, and conducting cultivating, so that a recombinant virus is obtained. Tests prove that an attenuated influenza tetravalent vaccine, which is prepared by virtue of a 7+2 plasmid rescuing system, can achieve an excellent immune effect through nasal immunization; the influenza virus, which is recombined by the 7+2 plasmid rescuing system, has a property of being time-efficient; in accordance with the epidemic characteristics of influenza viruses in various years, effective targeted influenza vaccines can be prepared; and the preparation method is rapid, obvious in immunogenicity and immune protection effect, and good in safety; therefore, the problems on safety and stability of attenuated influenza vaccines which are prepared by virtue of a conventional method are solved, and a protection spectrum of the influenza vaccines is more comprehensive.
Owner:CHANGCHUN HAIJIYA BIOTECH CO LTD

Freeze-drying slow-release protective agent used for preparing adenovirus preparation and adenovirus preparation and preparation method thereof

The invention discloses a freeze-drying slow-release protective agent used for preparing an adenovirus preparation and the adenovirus preparation and a preparation method thereof, which relate to thefield of an adenovirus preparation. The freeze-drying slow-release protective agent comprises a first solution containing sodium alginate and a second solution containing calcium chloride, the freeze-drying slow-release protective agent solves the problem of stability of an oral adenovirus preparation, has enteric characteristic, and can protect adenovirus from influence of gastric acid, and the preparation can keep stabilization under low-pH stomach environment, after entering into intestinal tract, the preparation is gradually disintegrated and releases adenovirus, and the adenovirus preparation is suitable for an oral administration mode, which overcomes inconvenience of an injection administration mode. The problem of easy deactivation of preservation of the adenovirus liquid preparation is solved, preservation time of the preparation is prolonged, the requirement of the adenovirus preparation on temperature during preservation and transport processes can be reduced, preparation stability is increased, and economic cost is reduced.
Owner:CHENGDU YUANRUI BIOTECH CO LTD

Subunit vaccine for porcine reproductive and respiratory syndrome as well as preparation method and application of subunit vaccine

The invention relates to the fields of genetic engineering and veterinary biological pharmacy, and in particular discloses a subunit vaccine for porcine reproductive and respiratory syndrome as well as a preparation method and application of the subunit vaccine. The invention firstly provides a fusion protein, wherein an amino acid sequence of the fusion protein is as shown in SEQ ID No. 1; and then the invention provides the subunit vaccine for the porcine reproductive and respiratory syndrome, wherein the subunit vaccine comprises the fusion protein. The fusion protein in the subunit vaccinefor the porcine reproductive and respiratory syndrome is obtained by conducting fusion expression on an ORF5 full-length gene of a PRRSV NADC30-like strain, which is optimized by virtue of a codon, and a gene of pseudomonas aeruginosa, from which a Domain III structural Domain is removed, and by virtue of an insect baculovirus/ insect cell expression system. The vaccine provided by the inventionis good in protective effect, capable of inducing effective humoral immunity and cellular immunity and is suitable for clinical prevention of the reproductive and respiratory syndrome.
Owner:WUHAN KEQIAN BIOLOGY CO LTD
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