Abstract: Disclosed is a temperature - sensitive (ts) mutant of bovine viral diarrhoea (BVD) virus which shows a considerably limited replication ability at the animal body temperature. The mutant is prepared by reacting wild-type BVD with a chemical mutagen such as nitrous acid. The mutant virous is advantageously used in vaccine compositions because it is capable of inducing immunity in bovines without causing serious side effects.

Abstract: DNA sequences and recombinant DNA molecules comprising at least a portion coding for all or part of subunits A and/or B of cholera toxin are prepared by enzymatic digestion of DNA of V. cholerae strains, isolating specific fragments and inserting them in appropriate vectors and subunits A and/or B of cholera toxin are prepared by culture of microorganisms containing said modified vectors.

Abstract: Alpha-1-antiprotease is highly purified from an impure solution thereof by a series of chromtographic procedures.

Abstract: A live bovine viral diarrhoea (BVD) virus vaccine capable of producing immunity in bovines without causing significant side effects comprising a temperature sensitive (ts) mutant of BVD virus which is obtained by mutating a strain of BVD virus with nitrous acid. The temperature sensitive mutants show a replication ability considerably limited at the animal body temperature of 39.5.degree. C. The vaccine may be combined with other live bovine vaccines such as respiratory virus vaccines and then administered to bovines.

Abstract: Detoxified but still immunogenic E. coli neurotoxin is prepared by bringing E. coli neurotoxin into contact with glutaraldehyde in mild operative conditions, the reaction being stopped where no more than 90% of the neurotoxin are inactivated.The obtained detoxified neurotoxin is valuable for immunizing piglets against oedema disease.

Abstract: Process for the non-degrading preparation of polysaccharide-protein complexes from bacterial capsules; the so-obtained products which are useful as vaccines against infection by the same bacteria and method for protecting human beings against the same infection by administration of pharmaceutical composition containing the polysaccharide-protein complexes.

Abstract: The invention relates to rotavirus vaccines for man and to methods of using them.The vaccines comprise an effective dose of bovine rotavirus which is either attenuated or inactivated.The invention comprises a method of immunizing human beings against human rotavirus infections by administering said vaccines by intramuscular, oral or nasal route; it further comprises a method of immunizing infants by boosting their mother with said vaccines prior to the birth of said infants.

Abstract: The invention relates to a novel influenza virus strain and to the influenza virus vaccine containing said strain.The new strain, which is the CNCM N.degree. I-099 strain, is prepared by recombination of the influenza A/PR/8/34 virus strain with the influenza A/California/10/78 (CNCM N.degree. I-098) virus strain.The vaccine is prepared by allowing the CNCM N.degree. I-099 strain to grow in the allantoic cavity of fertile hen's eggs, harvesting and freeze-drying the yielded virus material.The strain and the vaccine deriving therefrom are valuable for the immunization against influenza caused by influenza type A (H.sub.1 N.sub.1) virus strains.

Abstract: The invention relates to a novel influenza virus strain and to the influenza virus vaccine containing said strain.The new strain, which is the CNCM I-062 strain, is prepared by recombination of the influenza A/PR/8/34 virus strain with the influenza A/Alaska/5/77 virus strain.The vaccine is prepared by allowing the CNCM I-062 strain to grow in the allantoic cavity of fertile hen's eggs, harvesting and freeze-drying the yielded virus material.The strain and the vaccine deriving therefrom are valuable for the immunization against influenza caused by influenza type A (H.sub.3 N.sub.2) virus strains.

Abstract: E. coli heat stable (ST) enterotoxin derivatives are prepared by reaction of E. coli ST enterotoxin with crosslinking agents for proteins. The so-obtained crosslinked ST enterotoxins show immunogenic activity; they are valuable prophylactic agent for protecting man and animals against diarrheal disease provoked by E. coli enterotoxin and they may be formulated into compositions for intramuscular, subcutaneous or oral administration.

Abstract: The invention relates to an avian vaccine and to the preparation thereof.The vaccine according to the invention is a Newcastle disease virus vaccine. Its active ingredient is the P/77/8 NDV strain.The vaccine of the invention is useful in the prevention of Newcastle disease by administration to chickens in the form of an aerosol.