Antibiotics, nowadays, are not only used for the treatment of human diseases but also used in animal and poultry farming to increase production. Overuse of antibiotics leads to their circulation in the food chain due to unmanaged discharge. These circulating antibiotics and their residues are a major cause of antimicrobial resistance (AMR), so comprehensive and multifaceted measures aligning with the One Health approach are crucial to curb the emergence and dissemination of antibiotic resistance through the food chain. Different chromatographic techniques and capillary electrophoresis (CE) are being widely used for the separation and detection of antibiotics and their residues from food samples. However, the matrix present in food samples interferes with the proper detection of the antibiotics, which are present in trace concentrations. This review is focused on the scientific literature published in the last decade devoted to the detection of antibiotics in food products. Various extraction methods are employed for the enrichment of antibiotics from a wide variety of food samples; however, solid-phase extraction (SPE) techniques are often used for the extraction of antibiotics from food products and biological samples. In addition, this review has scrutinized how changing instrumental composition, organization, and working parameters in the chromatography and CE can greatly impact the identification and quantification of antibiotic residues. This review also summarized recent advancements in other detection methods such as immunological assays, surface-enhanced Raman spectroscopy (SERS)-based assays, and biosensors which have emerged as rapid, sensitive, and selective tools for accurate detection and quantification of traces of antibiotics.

Oral cavity is the easiest site of entry of microorganisms during breathing, eating, drinking and brushing which can lead to several bacterial infections in oral cavity, pharynx, larynx, gastrointestinal tracts etc. Toothbrushes commonly used to maintain oral health and prevent dental disease; but unfortunately, how keeping the toothbrush is neglected. A wide range of chemicals have been added to toothpastes in order to produce a direct inhibitory effect on plaque formation and kill microorganisms. The aims of the study were to investigate the relationship between toothbrush keeping place, its microbial content determine the type of micro-flora present in toothbrush kept in different locations and to determine efficacy of toothpaste in reducing micro-flora isolated from toothbrush. Used toothbrushes were taken from 21 individuals. 2 (1 herbal and 1 regular) toothpastes were selected for the study and were collected from local market. Standard pour plate method and plate count method were performed to determine the reduction of microbial load. Out of 21 toothbrushes, 19 (90.48%) were found to be growth positive and 2 (9.52%) were growth negative. Common Gram positive organisms isolates includes Lactobacillus species (20%), Bacillus subtilis (5%), Bacillus megaterium (5%), Stahpylococcus aureus (25%), Staphylococcus epidermidis (10%), Micrococcus species (10%) and Gram negative organisms isolated include Citrobacter freundii (5%), Pseudomonas aeruginosa (5%), Proteus mirabilis (5%), Enterobacter species (5%) and Klebsiella pneumonia (5%). Toothbrushes kept in the toilet/bathroom showed contamination with pathogens. Toothpaste T1 was found to be better at reducing microbial load compared to T2. Toilet/bathroom is the worst place for keeping toothbrushes. Toothpastes have their own patent, specialty and were found to be effective against the microorganisms. Synergistic interactions between the principal components of toothpaste can be considered to be a vital part of their efficacy.Kathmandu University Journal of Science, Engineering and TechnologyVol. 13, No. 2, 2017, page: 71-78

Objectives: The emergence of carbapenem resistant Klebsiella pneumoniae has been problematic in health sectors. It has been increasing widely in both hospital and community settings. The resistance acquired due to presence of Klebsiella pneumoniae carbapenemase (KPC) and Oxacillinase-48 carbapenemase (OXA-48) is of great concern. This cross-sectional study was designed to detect the carbapenem resistant gene namely blaKPC and blaOXA-48 in K. pneumoniae obtained from different clinical specimens.Results: Among the clinical isolates tested, culture positivity was 51.31% with K. pneumoniae as predominant isolates with 28.20%. AST revealed 38 (69.09%) carbapenemase producing K. pneumoniae while MHT con rmed 31 (56.36%) isolates as carbapenemase producer phenotypically. Similarly, highest percentage of carbapenemase production was seen in sputum (45.16%), in male (67.74%), in age group 51-60 (25.80%) and in OPD (45.16%). PCR screening was done for 31 carbapenemase producing isolates to detect blaKPC and blaOXA-48 genes. Two (6.45%) isolates were positive for blaKPC gene and 9 (29.03%) for blaOXA-48 genes. Signi cant numbers of blaKPC and blaOXA-48 genes were detected in carbapenem resistant Klebsiella pneumoniae from clinical isolates.

Human Coronaviruses (HCoV) exhibit positive single stranded RNA genome with enveloped nucleocapsid. Coronavirus belongs to the family Coronaviridae, originated from avian and mammalian species causes upper respiratory tract infection in humans by novel HCoVs viruses named as HCoV-HKU1, HCoV-NL63 but predominant species is Middle East respiratory syndrome (MERS-CoV) across the world. HCoV-HKU1 sp. is associated with chronic pulmonary disease, while HCoV-NL63 causes upper and lower respiratory tract disease in both children and adults, but most recent one was MERS-CoV, which caused acute pneumonia and occasional renal failure. The novel coronavirus SARS-CoV-2 is a new strain that causes the Coronavirus Disease 2019 (COVID-19) as named by the World Health Organization. According to the recent world statistics report about the COVID-19 cases approx. 101,500 confirmed cases and 3,500 death cases appeared. And mostly, a case of infection with CoV was identified in Wuhan, China. Structurally viral genome constitutes of 2/3rd of replicase gene encoding ORFs regions and rest of the 1/3rd region of genome form the structural proteins. The aim of the study was to understand the viral genetic systems in order to facilitate the genetic manipulation of the viral genome and to know the fundamental mechanism during the viral replication, facilitating the development of antidotes against the virus.

Water covers seven tenths of the Earth's surface and occupies an estimated total volume of 1,386,000,000 cubic kilometers (km 3 ). Of all the water found on Earth, 97% is marine. Maximum of this water is at a temperature of 2 to 3°C and devoid of light; 62% is under high pressure (>100 atm). Microscopic phytoplankton and associated bacteria generate a complex food web that can extend over long distances and extreme depths. The marine environment looks so vast that it will not be able to be exaggerated by pollution; however, in coastal areas human activities are increasingly disrupting microbial processes and damaging water quality.