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Embryonated eggs were coinfected with two strains of the coronavirus avian infectious bronchitis virus (IBV), IBV-Beaudette and IBV-M41, to investigate whether recombination between the two strains would occur. Virions were isolated from the allantoic fluid of the coinfected…

Nitric oxide (NO) was produced when bovine peripheral blood mononuclear cells (PBMC) or purified, adherent PBMC (macrophages) were incubated in vitro with bovine recombinant interferon gamma (Bo rIFN-?). NO was produced by cells from naive, uninfected calves as well as by…

Streptomyces thermoviolaceus is a thermophilic actinomycete that was found to produce relatively large amounts of extracellular peroxidase activity when grown on xylan as primary carbon source. The activity was due to multiple isoforms of peroxidase, of which two, designated…

A 7-kb fragment of Streptomyces rochei A2 chromosomal DNA was cloned into pAT153 and shown to confer endoglucanase (Eg1S) activity on Escherichia coli cells. In E. coli clones, the Eg1S was secreted into the periplasm. Deletion analysis revealed that an 827-bp fragment was…

CD33 monoclonal antibodies recognize a 67-kD glycoprotein of unknown function that is expressed by early myeloid progenitors and their leukemic counterparts. We report here the cloning of the murine homolog of the human CD33 antigen. Two cDNA clones, differing by an 83-…

An enzyme-linked immunosorbent assay (ELISA) using sporozoite, schizont and piroplasm antigens was developed to study the immune response of animals that had been immunised with either Theileria annulata sporozoites or schizont-infected cells and then challenged with…

This work extends basic knowledge of tropical theileriosis in taurine and crossbred cattle. Infection of Bos taurus and Bos taurus cross BON indicus (Sahiwal) calves with graded doses of sporozoites of Theileria annulata (Hissar), an Indian stock of the parasite, showed the…

The establishment of 5 continuous cell lines from embryonic tissues of H. a. anatolicum is reported. Each line comprises 2 or more cell types; they are maintained at 28 and 32°C in L-15/H-Lac medium with 20% fetal calf serum, and have been cryopreserved successfully…