Salivary IgG and IgA in newborn calves and the possible role in the assessment of passive immunity transfer.

Introduction: The transfer of immunoglobulins from the mother to newborns is widely recognized as a critical event for safeguarding offspring against potentially life-threatening infectious diseases. Mainly for this reason, this study aimed to assess the concentrations of immunoglobulin G (IgG) and immunoglobulin A (IgA) in the saliva of newborn calves and explore its potential use for monitoring passive immunity transfer from cows to calves, as also to evaluate how colostrum intake affects serum and saliva IgG and IgA concentrations. Methods: The quality of colostrum samples was evaluated using an optical refractometer before administration to the calves. Saliva and blood samples from 24 calves were obtained at the day of birth (T0) and 2 days after (T2) for determination of serum concentrations of total protein by refractometer, IgG and IgA (both on serum and saliva) by ELISA test. Results: Positive correlations were observed between salivary IgA at T2 and salivary IgG at T2. A significant increase in both IgG and IgA levels in calf serum and saliva was noted. Salivary IgA levels can reflect salivary IgG levels. Discussion: These findings suggest the potential utility of IgA in monitoring passive immunity transfer, and do not exclude saliva as an alternative, practical, and non-invasive matrix for assessing passive immunity transfer.

Can peri-surgical electroacupuncture relieve immunity suppression? A pilot study in dogs.

General anesthesia and surgical stress can suppress the immunological response by acting both directly on the immune system and indirectly on the hypothalamic-pituitary-adrenal axis and the sympathetic nervous system. Disturbance of the immune system during the perioperative period can lead to complications such as wound-healing disorders and infections up to sepsis. Effectiveness of acupuncture in regulating the immune function by increasing leukocyte numbers and inhibiting inflammatory response has been proven. This study aimed to explore the impact of electroacupuncture (EAP) on the dynamic balance of the immune system and immune cell populations in dogs undergoing surgery. Twelve healthy bitches scheduled for elective ovariectomy were divided into two groups according to whether (EAP, n=6) or not (CTR, n=6) a peri-operative electroacupuncture treatment was performed. Levels of leukocytes (neutrophils, monocytes, T- and B-cells) and immunoglobulins M (IgM) and A (IgA) were measured in blood samples collected before (T0), 1 h (T1) and 2.5 h (T2) after anesthesia induction. Leukocytes count decreased from T0 to T1 in both groups and restored within 1.5 h in EAP group whereas remained significantly lower in CTR group (P<0.02). In particular, neutrophils and monocytes increased in dogs receiving EAP (P<0.01) while T-cells decreased in CTR group (P<0.04) at T2. B-cells and cytotoxic T-cells decreased in EAP dogs (P<0.04) at T2. No differences in helper T-cells, IgM and IgA levels were recorded between groups and over time. Our results suggest a modulatory effect of EAP on the immune system which is early expressed on neutrophils, monocytes and T-cells.

Effectiveness of anthracycline against experimental prion disease in Syrian hamsters.

Prion diseases are transmissible neurodegenerative conditions characterized by the accumulation of protease-resistant forms of the prion protein (PrP), termed PrPres, in the brain. Insoluble PrPres tends to aggregate into amyloid fibrils. The anthracycline 4'-iodo-4'-deoxy-doxorubicin (IDX) binds to amyloid fibrils and induces amyloid resorption in patients with systemic amyloidosis. To test IDX in an experimental model of prion disease, Syrian hamsters were inoculated intracerebrally either with scrapie-infected brain homogenate or with infected homogenate coincubated with IDX. In IDX-treated hamsters, clinical signs of disease were delayed and survival time was prolonged. Neuropathological examination showed a parallel delay in the appearance of brain changes and in the accumulation of PrPres and PrP amyloid.

Intravenous immunoglobulin transfusion in colostrum-deprived dairy calves.

Immunoglobulin transfusion is employed in the management of the failure of passive transfer (FPT). The aim of this study was to investigate the dose of immunoglobulin G (IgG) needed to reach a protective concentration (>10 g/L) in colostrum-deprived dairy calves. Twenty-eight Holstein Friesian newborn male calves were randomly assigned to either a control group (CG) or a treatment group (PG). Calves in the CG received 4 L of high quality colostrum within 12 h of birth. Calves in the PG received 62.7 ± 3.1 g of IgG IV in 2.6 ± 0.3 L of plasma within 6 h after birth. Serum immunoglobulin G (sIgG) and serum total protein (sTP) concentrations were assayed before and after (24 h, 72 h and 1 week after birth) plasma transfusion or colostrum ingestion. Serum (s) IgG and sTP concentrations increased in both groups throughout the period of observation. Mean sIgG and sTP concentrations after colostrum ingestion or plasma transfusion were higher in the CG than in the PG (P <0.01). Nine treated calves developed diarrhoea during the study and four were humanely euthanased due to progressive clinical deterioration. None of the calves in the CG showed signs of disease or died during the study. The dose of IgG used in this trial effectively provided an adequate sIgG concentration in colostrum-deprived calves (>10 g/L). Calves in the CG had significantly lower morbidity and mortality rates compared to those in the PG, suggesting that plasma transfusion alone is ineffective in providing complete protection against neonatal disease.

Immunoglobulins G and lysozyme concentrations in canine fetal fluids at term of pregnancy.

In the dog, the endotheliochorial placenta allows only the 5% to 10% transfer of maternal antibodies to the fetus, but the timing and the factors influencing the immunoglobulin G (IgG) transplacental transport were not fully investigated. The aims of the present study were the following: (1) to assess the presence of both IgG and lysozyme in amniotic and allantoic fluids collected from fully developed and viable newborn puppies born by elective cesarean section at term and possible correlations between amniotic and allantoic IgG and lysozyme levels; (2) to verify possible differences in IgG and lysozyme concentrations between the two fluids; and (3) to detect possible differences in IgG and lysozyme fetal fluid levels in relation to the maternal breed body size and parity, as well as to the neonatal gender. The study, performed on 41 purebred bitches submitted to elective cesarean section at term, enrolled 142 puppies, 74 males and 68 females, born mature, viable, without gross malformations, and with a normal weight. At surgery, a total of 129 amniotic and 84 allantoic samples were collected for IgG and lysozyme analysis. Class G immunoglobulins and lysozyme were detected in both fluids, but IgG concentrations were higher (P < 0.01) in amniotic fluid. Moreover, a significant positive correlation (P < 0.01) between IgG amniotic and allantoic levels, but not for lysozyme, was observed. A significant effect of the maternal parity (P < 0.05), but not of the breed body size, on the amniotic IgG concentrations was found, whereas the newborn gender was not associated to different IgG or lysozyme amniotic or allantoic levels. Given the significant contributions of fetal fluids to fetal and neonatal health, the results reported that the amniotic and allantoic fluids play a role in the immune protection of the fetus/newborn also in canine species. However, additional research is needed to better elucidate both the origin of IgG and lysozyme and the factors influencing the wide interindividual variations.

Seroepidemiological and clinical survey of feline immunodeficiency virus infection in northern Italy.

Four hundred and thirty-nine feline serum samples from cats with different living conditions in the north of Italy were tested for antibodies to feline immunodeficiency virus (FIV) and for antigen of Feline Leukemia Virus by enzyme-linked immunosorbent assay. A Western blot technique was also used on the positive sera in order to confirm the presence of specific antibodies to FIV. The Western blot enabled the detection of a false positive serum. The prevalence of FIV infection in this population was 12.5% and among the seropositive cats a greater proportion was male (74.5%) than female (25.5%). A correlation between the clinical status and the evolution of the pathology is described together with a score based on the severity of the stomatitis in infected cats. The Western blot patterns of positive samples were then compared with the stage of the pathology. Statistical analysis on the distribution of FIV in stray cats, cats with garden and courtyard access and strictly house-confined cats showed a highly significant risk of the infection in the first group.

Avian influenza epidemic in Italy due to serovar H7N1.

Beginning at the end of March 1999, a syndrome characterized by severe depression, anorexia, fever, and respiratory and enteric symptoms appeared in flocks of turkeys and, to a lesser extent, of chickens in the densely populated poultry-rearing regions of northeast Italy. The disease was characterized by sinusitis, tracheitis, peritonitis, and pancreatitis. The mortality varied between 5% and 90%. The disease was diagnosed as low pathogenic avian influenza, H7N1 serotype. After a summer period of declining cases, the disease reappeared in autumn exclusively in turkeys. Since the middle of December 1999, many farms of chickens, turkeys, and guinea fowl were abruptly affected by a highly pathogenic H7N1 virus, with very severe depression and mortality up to 100% in a few days. By the end of March 2000, nearly 500 farms, representing over 15 million birds, were affected or depopulated. To date, control measures have focused on improved biosecurity measures. Vaccine was not allowed, but its use was debated.

Pseudotuberculosis in marmosets, tamarins, and Goeldi's monkeys (Callithrichidae/Callimiconidae) housed at a European zoo.

Yersinia pseudotuberculosis is an insidious bacterial infectious agent distributed worldwide and endemic to European countries. It has caused several animal deaths and may threaten the effectiveness of breeding projects for endangered species. In this retrospective study, we examine the prevalence of pseudotuberculosis in Jersey Zoo (Channel Islands, U.K.) over a period of 16 yr to obtain information that can be applied to prevent the infection. The efforts made to control the disease through vaccination are also explored. Our results show that pseudotuberculosis has been endemic to Jersey Zoo since 1979 and is responsible for significant animal loss in the Callithrichidae/Callimiconidae group. Mortality due to Y. pseudotuberculosis was seasonal; a high percentage of deaths occurred during wet and cold seasons. No significant difference was found in mortality rates of vaccinated versus nonvaccinated animals. Although the efficacy of vaccination has not been confirmed, we believe that an improved vaccination program could be an important tool in controlling outbreaks of infection in marmosets and tamarins.

[Radiation exposure of the embryo and the fetus: real risks or unjustified fears?]. / Esposizione alle radiazioni dell'embrione e del feto: rischi reali o ingiustificati timori?

The authors discuss the problem of radiation damage to the individual developing in utero, and summarize the information available in the literature on the subject. Additional risks induced by ionizing radiations are classified with reference to gestational age and dose absorbed by the fetus. Such risks concern the possibility of mental retardation from the 8th to the 15th gestational week, and of developing a malignant disease from the 3rd to the 15th gestational week. We report the dose values received by the fetus as a result of both radiodiagnostic examinations and the Chernobyl nuclear accident: the doses were generally very low, which leads us to the conclusion that additional risks are of the same order of magnitude as the fluctuations in the natural congenital malformations. Thus, prenatal irradiation for diagnostic examinations does not generally represent a reason to recommend therapeutic abortion. However, it is always important to carry out a careful evaluation of the dose absorbed by the fetus and to correctly inform the mother about eventual radiation-induced risks.

Restriction endonuclease analysis of the genome of two Italian caprine herpesvirus 1 strains.

Two caprine herpesvirus (CpHV.1) strains isolated in two goat flocks in southern Italy were compared with E/CH and McK/US reference CpHV.1 strains by restriction endonuclease analysis. BamHI, KpnI, NotI and PstI restriction enzymes were used. With these enzymes McK/US strain was clearly differentiated from the others. KpnI and NotI digestion resulted in unique patterns for all four strains. Restriction enzyme analysis might be a useful method to distinguish CpHV.1 isolated from animals and provide a basis for further epidemiological studies of the CpHV.1 infection.

Effect of administration of vitamin E and selenium during the dry period on mammary health and milk cell counts in dairy ewes.

The effect of parenteral administration of two subcutaneous injections of vitamin E and Se (5 mg and 0.1 mg/kg of body weight, respectively) during the dry period on the mammary health and milk somatic cell counts of 25 dairy ewes was investigated. Supplementation reduced somatic cell counts (5.4 vs. 6.0 log10) during the subsequent lactation but had no effect on the incidence of clinical mastitis (4% vs. 6%) and intramammary infections (9.0% vs. 11.3%). Furthermore, the administration of vitamin E and Se was associated with differences in differential cell counts of milk samples (macrophages, 48.8% vs. 38.4%; polymorphonuclear neutrophils, 40.1% vs. 50.7%; and eosinophils, 0.7% vs. 1.4% for control ewes and ewes receiving supplements, respectively). The administration of these supplements also increased erythrocyte glutathione peroxidase activity (139.5 vs. 86.3 U/ml of packed cell volume) and the percentage of blood neutrophils that reduced nitroblue tetrazolium after bacterial extract stimulation (48.6% vs. 38.7%). Parenteral administration of vitamin E and Se to ewes during the dry period appeared to have influenced mammary gland status during the subsequent lactation and particularly total and differential milk cell counts.

Value of the dorsal cutaneous guinea pig model in selecting topical antiviral formulations for the treatment of recurrent herpes simplex type 1 disease.

Recurrent herpes simplex labialis represents a disease still difficult to treat, despite the availability of many established antiviral drugs used in clinical research since 30 years ago. Although differences between the human disease and that obtained in experimental animal suggest caution in predicting an effective clinical response from the experimental results, some of the animal models seem to be useful in optimising the topical formulation of single antiviral drugs. In the present work the dorsal cutaneous guinea pig model was used to compare 5 different topical antiviral formulations with clinical promise (active molecule: 5% w/w micronized aciclovir, CAS 59277-89-3), using both roll-on and lipstick application systems. The aim being to evaluate which vehicle (water, oil, low melting and high melting fatty base) and application system (roll-on, lipstick) enhances the skin penetration and the antiviral activity of the drug, after an experimental intradermal infection with Herpes simplex virus type 1 (HSV-1). As reference, a commercial formulation (5% aciclovir ointment) was used. The cumulative results of this study showed that the formulation A, containing 5% aciclovir in an aqueous base in a roll-on application system, has the better antiviral efficacy in reducing the severity of cutaneous lesions and the viral titer; among the lipsticks preparations, the formulation D, containing 5% aciclovir in a low melting fatty base, demonstrates a very strong antiviral activity, though slightly less than formulation A. This experimental work confirms the validity of the dorsal cutaneous guinea pig model as a rapid and efficient method to compare the antiviral efficacy of new formulations, with clinical promise, to optimise the topical formulation of the active antiviral drugs.