A partir de 106 porcelets, âgés de I jour à 5 semaines, atteints de troubles digestifs, les auteurs constatent la très grande importance de la gastro-entérite transmissible (66 p. 100 des 50 élevages étudiés) associée à la colibacillose dans la moitié des cas. Il s’agit de la forme aiguë classique, hautement contagieuse, d’incubation très courte et d'évolution rapide entraînant pratiquement 100 p. 100 de mortalité des porcelets âgés de moins de huit jours. Les deux tiers des cas restants correspondent à une forme sub aiguë atypique, de contagiosité irrégulière, d'incubation très variable et d’évolution longue, entraînant une mortalité nulle ou faible, mais surtout un retard de croissance au moment du sevrage ou pendant la période d’engraissement. La présence de cette dernière forme est peut-être en rapport avec l’existence de souches moins virulentes, mais plus vraisemblablement avec les entrées continuelles de porcs à l’engraissement et avec l’existence de mise-bas toute l'année dans les élevages.
A serological survey made in France reveals a rather large diffusion of the Parvovirus among pig herds.45 . 2 per cent of the analysed sera show a level of antibodies equal or superior to 1/320 e.Two routes of infection of the breeding animals are considered: the venereal route .certainlyplays an important part in the dissemination of the virus.After settlement of an immunity subsequently to a contamination of a herd, an infection can be started again with -newly introduced breeding animals, the serum of which is devoid of Parvovirus antibodies.These clinical observations have been experimented on an S.P.F.pig in contact with in utero infected pigs exhibiting a progressively decreasing antibody level.A survey of the microflora specific of respiratory diseases in « minimal disease » and conventional pig herds
An intra venous injection or 1.1'.+ intra tracheal injcction in swine might kill the animal when the amount of microorganisms is large.The disease is septicemic without any pulmonary localization.To " fix " Pasteazvella inside the lungs they should be damaged previously.P. Ull iltocida is well known as an " opportunist " invading the breached tissues.Therefore, we choosed the administration of embryonated Ascari.ssuzinr eggs to 8 days before the trial.Ascaris + Pasteurella gi 1' cn by uzebulisatioza : (particle size I to 3 [1 ) the characteristics of the disease were : severe respiratory svmptoms with high hvperthermia, --polyarthritis (the septicemic facet of Pasteurella), -a loss in weight and an acute broncho pneumonia with an average death time of 5 days.Ascavis -+-Pasteaevella given by intra tracheal (and 1. 1'.) route: the same disease was obtained, but without polyarthritis.The acute broncho pneumonia was severe and death occurred 4 to 8 days after and was dose-related.Emphasis must be laid on the difficulty of reproducing in the laboratory a disease so com- monly found in the field, as the purpose was to ol>tain a regular course and not a too early mortality.
As part of a systematic study of hemostasis in the pig, we studied the properties of platelets in that species.After briefly describing their basic role in the hemostatic mechanism, we examined the volume and density distribution of platelets in the pig, comparing our results with those obtai- ned in man.Colibacillar enterotoxic syndrome of the pig in France L. RENAULT, Cl.MAIRE, J. VAISSAIRE 1!'tablissemeuts .Sanders, li, quai de l'Industrie, 912(;0 /Mf!'!-St«'-0)'!fA serological grouping of 147 7 Escherichia coli strains, isolated from 52 newborn piglets and from 105 piglets at weaning revealed that 3/1 of the strains were enteropathogenic.In the new born piglet, the strains isolated were mainly oI -j9 Ii 9I , K 8S ac and in the piglet at weaning, by order of frequency : 0141 K 8 5 ab, K 88 ac, o 1 4g : K g K 88 ac and o8 : 1v 8!, 1< 88 ac.Colistine excepted, all strains showed a considerable lowering of scnsitivity towards all cur- rently used antibiotics.Vaccinations made peroral or from specific fractions of enterotoxines seem to be promissing.
An intra venous injection or 1.1'.+ intra tracheal injcction in swine might kill the animal when the amount of microorganisms is large.The disease is septicemic without any pulmonary localization.To " fix " Pasteazvella inside the lungs they should be damaged previously.P. Ull iltocida is well known as an " opportunist " invading the breached tissues.Therefore, we choosed the administration of embryonated Ascari.ssuzinr eggs to 8 days before the trial.Ascaris + Pasteurella gi 1' cn by uzebulisatioza : (particle size I to 3 [1 ) the characteristics of the disease were : severe respiratory svmptoms with high hvperthermia, --polyarthritis (the septicemic facet of Pasteurella), -a loss in weight and an acute broncho pneumonia with an average death time of 5 days.Ascavis -+-Pasteaevella given by intra tracheal (and 1. 1'.) route: the same disease was obtained, but without polyarthritis.The acute broncho pneumonia was severe and death occurred 4 to 8 days after and was dose-related.Emphasis must be laid on the difficulty of reproducing in the laboratory a disease so com- monly found in the field, as the purpose was to ol>tain a regular course and not a too early mortality.
