The viruses of the family Coronaviridae are ubiquitous in nature due to their existence in a wide spectrum of mammals and avian species. The coronaviruses, as RNA viruses, exist as quasispecies because of their high rate of mutations. This review elaborates on the pathogenesis and the developed vaccines of most of the ubiquitous coronavirus' diseases, mainly bovine, dromedary camel, porcine, feline, canine, and avian coronaviruses. The review emphasizes the significant setbacks in the full exploitation of most of the pathogenesis of the coronavirus' diseases, raising the prospect of effective vaccines for these diseases. The therapeutical trials for the treatment of SARS-CoV2 and the setbacks of these trials are also addressed. The review draws attention to the lessons accumulated from the large number of studies of the pathogenesis of animals and birds' coronaviruses and their vaccines, particularly the bovine, feline, and avian coronaviruses. The lessons drawn from the studies will have an immense influence on how the human coronaviruses pathogenesis and vaccine development will proceed. In addition, the extensive efforts to designate suitable animal models to study the lately emerged human coronaviruses are one of the invaluable contributions carried out by veterinarian scientists. Finally, factors and determinants that contribute to the possibility of emerging new coronavirus zoonotic disease are elaborated on and a call goes out to urge transdisciplinary collaboration in the implementation of the "One Health" concept.

Staphylococcus aureus (S. aureus) is a major causative agent of mastitis and is resistant to many antibiotics. Thus, there is a need to characterize the genetic determinants of S. aureus erythromycin resistance, such as ermA, ermB and ermC. The current study aimed to determine the phenotypic and genotypic erythromycin resistance profile and relatedness of S. aureus recovered from bovine mastitis and humans in close contact. A total of 14 mastitis-infected buffalo milk samples and 16 samples from their respective milkers were collected from different farms of Lahore, Pakistan. The antibiotic resistance profile was determined through the disk diffusion test. The overall prevalence of S. aureus in mastitis-affected buffaloes was found to be 75%, of which 52.1% were resistant to erythromycin and 42.8% to clindamycin. S. aureus isolates recovered from milker nasal samples showed 56.25% resistance to erythromycin and 44% resistance to clindamycin. Genotypic antibiotic resistance profiles were determined from 14 milk samples through PCR. Overall, eight (52.1%), three (21.4%) and five (35.7%) S. aureus isolates were positive for the ermA, ermB and ermC genes, respectively. Moreover, 16 milker nasal S. aureus isolates were also tested for the presence of ermA, ermB and ermC genes. The ermA, ermB and ermC genes were observed in nine(56.7%), five (31.3%) and seven (43.7%) isolates, respectively. A significant association was shown between phenotypic and genotypic erythromycin resistance. The results indicate both that there are sufficient genetic similarities, and the actual transmission of erythromycin resistance genes between these two hosts of S. aureus.

Mycobacteriumavium subsp. paratuberculosis (MAP) infection in camel requires extensive research, particularly the immune responses in the intestine. This study aimed to investigate the nature of the cellular populations that are driven by the immunopathological responses in the camel intestine infected with MAP at different ages. Immunohistochemical staining was carried out on tissues obtained from naturally infected young (5–10 years old) and older (12–15 years old) camels. The staining of the tissues, ileum, mesenteric lymph node, jejunum, and supramammary lymph nodes, with anti-CD3+, CD4+, CD8+, CD25+, CD11c+, CD14+, WC1+, CX3CR1, and Madcam-1 monoclonal antibodies revealed high expression of the molecules CD8+, CD25+, CD11c+, CD14+, WC1+, CX3CR1, and Madcam-1 in the ileum and mesenteric lymph node of the infected older camels. The results indicated the recruitment of CD8+lymphocytes, CD14+ macrophages, and CD11c+ dendritic cells to the ileal lamina propria. High expression of CX3CR1 could indicate a vital role for this special macrophage phenotype in the ileal lamina propria in maintaining intestinal homeostasis. Madcam-1 expression could have an essential role in defining the nature of the recruited cells to the site of the infection. Expression of CX3CR1 and Madcam-1 is a novel finding that merits further attention and pursuit to reveal their significance in the immune responses to MAP in the camel’s intestine.

Dromedary camel (Camelus dromedarius) can survive and produce considerable amount of milk during recurrent and prolonged hot and dry environment. Camel milk considered one of the most valuable food sources due to its nutritional value. Intramammary infection and other low hygienic measurers are the main factors that undermined the camel mammary gland welfare. Available studies elaborated in detail the role of innate factors like Peptidoglycan recognition protein and Lactoferrin in camel milk as potent antimicrobial factors. Despite the wide studies on camel antibodies, their role in the mammary gland immunity was scarcely addressed. The major lack of information about the immune system of camel mammary gland is of great setback in improving the camel dairy industry. This review has evaluated the available data on different aspects of the mammary immune system. The available data unfortunately are of general profile, which created wide gaps in understanding the camel mammary gland immune system in health and disease. Several measures were proposed as necessary approaches to drive considerable interests of wide and in depth research on the camel mammary gland immune system.In conclusion, the available knowledge on the immune system of camel mammary gland suffers from major lack in the role of the immunoglobulins in health and mastitis. Although, acceptable progress was made on defining the cellular populations of the mammary gland, their main activity during the infection needs to be revealed.

The camel economy is of considerable importance for arid countries. In the last decade, studies about camel immune system and immune responses have recorded increasing interest. However, drawing a comprehensive picture of the camel immune system remains far from reached. A major part of this review is to cover the studies of the primary and secondary immune organs and the markers of the camel immune cells and certain lymphoid tissues. At the same time, immune responses to different diseases and the nature of effective immunity were included, with an emphasis on the most important zoonotic diseases in camels such as MERS CoV; brucellosis. New findings on the diversity mechanisms of camel immunoglobulin genes were addressed. However, detail of the mechanism of MHC-restricted cellular immunity and the mechanism of B lymphocyte activation in camels await further attention. Interestingly, the gross and the histological structure of the lymphoid tissues of the camel's thymus, tonsils, and peyer's patches have indicated significant differences from other animals in terms of structure and function. The most peculiar CD expression, such as LPAM-I, MAdCAM-1 and CX3CR1, in certain camel cells and tissues refers to possible extraordinary mechanisms of immune hemostasis in camel in comparison to other ruminants. The widely applied immunodiagnostic techniques to control camel diseases and to assist in improving the camel resistance were considered. Extensive studies of the camel immune system were greatly hampered by lack of specific reagents to camel markers and low funds in the field of camel immunology.