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[Acid-stable and acid-labile interferons inducible by the bovine infectious rhinotracheitis virus].

Attenuated and virulent strains of cattle infectious rhinotracheitis virus (IRTV) induced in cattle leukocytes the production of both acid-stable and acid-labile interferon. The attenuated IRTV strain induced the production of the acid-labile interferon in spleen and bone marrow cells of BALB/C mice. The indication of the assignment of the acid-labile interferon to the leukocyte-type of interferon consists in the activity of bovine interferon in a heterologous culture of human diploid fibroblasts and a higher interferon titer in bone marrow than in spleen cells (bone marrow cells contain B-cells which produce leukocyte interferon).

Animals↗

A study on the sensitivity of bovine rotavirus to some chemical agents.

The behaviour of bovine rotavirus, strain 81/36 F, to some chemical agents was studied. The chemicals tested were all more or less effective, depending on their concentration and time of exposure under room temperature. It is suggested therefore, that they could be used as disinfectants in the case of rotaviral contamination.

Animals↗

Assessment of biological activity of immunoglobulin preparations by using opsonized micro-organisms to stimulate neutrophil chemiluminescence.

We have used the ability of opsonised bacteria to stimulate luminol enhanced chemiluminescence of human neutrophils to examine the opsonic capabilities of normal and hypogammaglobulinaemic sera for four common bacterial pathogens. Preparations of human immunoglobulin modified for i.v. use have then been compared with unmodified Cohn Fraction II for their effectiveness in improving opsonization when added to antibody deficient sera in vitro. Hypogammaglobulinaemic sera exhibited impaired opsonisation of Haemophilus influenzae, and severely antibody deficient sera also opsonized Streptococcus pneumoniae and Pseudomonas aeruginosa poorly. The opsonization of these organisms was improved by Cohn Fraction II, and by pH 4 and beta-propionolactone treated immunoglobulins, in descending order of effectiveness. Pepsin digested immunoglobulin was inactive, and in some cases impaired opsonic capacity. The opsonisation of Staphylococcus aureus by hypogammaglobulinaemic sera was near normal, and was not improved by any immunoglobulin. This technique, which assesses biological activity of immunoglobulin, is useful in comparing preparations, and may help to establish appropriate dosage and frequency for intravenous immunoglobulin replacement therapy.

Adult↗

Experience with monovalent and bivalent influenza vaccines in Canada 1976.

Laboratory examination of vaccines from four manufacturing companies and prepared with A/New Jersey/8/76 and A/Victoria/3/75 strains (clinical results, cf. these proceedings, pp. 267-272). When diluting the concentrated suspensions of vaccine, loss of activity can be avoided by adding a small amount of Tween 80 to the diluent.

Canada↗

[Prophylaxis and therapy with gamma globulin. General characterization and clinical use of gamma globulin preparations].

For accurate evaluation of the usefulness of gamma-globulin treatment, the clinical indications for passive immune prophylaxis and immunotherapy and the specific characteristics of commercially available gamma-globulin preparations have to be considered. Detailed investigations of currently used gamma-globulin preparations have shown that as yet no ideal product is available. Classical standard gamma-globulin and, in particular, enzymatically treated (Gamma-Venin, Veinoglobuline) or chemically modified preparations (Gamma-Globulin i.v. SRK, Intraglobin) for intravenous use have some deficiencies and involve potential risks for the patient. Nor is the infusion of "fresh frozen plasma" a safe and generally applicable alternative to the use of gamma-globulin concentrates. Thus from the outset the preconditions for effective treatment with gamma-globulin are not optimal. Standard and hyperimmune preparations, given once intramuscularly, are suitable for the prophylaxis of viral and bacteriotoxic diseases. In patients apt to react abnormally it is important to distinguish clearly between the few accepted indications and those that are more doubtful. Anti-D immunoglobulin is essential for the prevention of Rhesus sensitization after the delivery of a Rhesus-positive child. In general, gamma-globulin is recommended for substitution therapy and for the prophylaxis of recurrent acute bacterial infections in patients suffering from transient, congenital and acquired antibody-deficiency states. In such cases, high doses of an intravenously administrable preparation with a relatively long biologic half-life are recommended. The evidence for the effectiveness of gamma-globulin treatment of bacterial infections in patients without manifest disturbance of humoral immunity is equivocal. This is true, for example, of the oft-recommended combined use of antibiotics and high doses of intravenous gamma-globulin which is said to provide optimum antibacterial and antitoxic protection. There is even less chance of obtaining beneficial effects if gamma-globulin is given as an "ultimo ratio" in severe generalized bacterial infections resistant to antibiotic treatment. Localized and predominantly chronic infections are barely influenced by gamma-globulin. It is still too early to make a final assessment regarding the place and value of immunoglobulin concentrates for prophylactic and therapeutic purposes. This will only be possible if a preparation becomes available which contains all immunoglobulins in a biologically optimum state and concentration, is well tolerated and can be given in adequate doses both intramuscularly and intravenously.

Complement System Proteins↗

Production of murine cytotoxic T lymphocytes by bluetongue virus following various immunisation procedures.

The induction of bluetongue virus specific cytotoxic T lymphocytes (CTLs) in C3H mice by various live and inactivated bluetongue virus preparations was studied. Live virus preparations were shown to induce good levels of CTLs; however, inactivation of virus preparations either by beta propriolactone or glutaraldehyde induced only a low level response. The use of Freund's adjuvants and double immunisation procedures failed to improve the response of the inactivated preparations. These findings are discussed in relationship to protection from bluetongue disease with various bluetongue virus vaccines.

Animals↗