Background: The SARS-COV-2's spread from continent to the continent has resulted in an increased number of mutations in the viral gene encoding proteins. As a result, mutations in target proteins provide a significant challenge in creating antiviral drugs and vaccines. The present review discussed the COVID-19 epidemiology and the effects of drugs being tested against COVID-19/SARS-COV-2. Dosage of these drugs along with associated challenges was also discussed. Methodology: Systematic review was conducted after a thorough search in the "PubMed, NIH, Elsevier, Scopus, Web of Science, Science Direct, and Google Scholar database. 45 studies on drugs associated with COVID-19 fulfilled the inclusion criteria and were selected for this review. Results: The FDA only accepted the Remdesivir drug against SARS-COV-2, as the hospitalized patients recovered very quickly by taking it. Antiviral EIDD-2801 has been found to make the SARS-COV-2 unable to infect cells by causing genetic modifications in the virus RNA. Similarly, Nitazoxanide appeared beneficial against SARS-COV-2 in a primary intervention and severe conditions (including pregnancy) without undesirable effects on the newborns. Children with mild cases can be handled solely by proper caring. Conclusion: Although Remdesivir and Dexamethasone are recommended in severe cases, clinical trials are ongoing to investigate other possible therapies like MAb and Convalescent Plasma antibodies for COVID-19. Older drugs (usually used to treat other conditions) are also under-tested by researchers to see if they are effective for COVID-19. Further tests are essential to validate whether any of the mentioned above possible therapies would be helpful for COVID-19 treatment.

Mastitis is аn inflammation оf thе mammary gland, caused by the invasion and duplication оf Escherichia coli (E. coli) , Staphylococcus uberis (S. uberis) аnd Staphylococcus aureus (S. aureus) аnd а wide variety оf оthеr microorganisms thrоugh teat оr damaged nipple, decreasing potential milk production іn thе affected quarter оf mammary gland. Economic, animal productivity, international trade and animal welfare issues associated with mastitis play an important role in the agricultural industry. Therefore, worldwide dairy cattle breeding programmes are trying to breed cows wіth improved resistance tо mastitis. Mastitis can’t be eliminated but can be reduced to a low level. It can be achieved by breeding strategies, reducing the exposure to pathogen and increasing the resistance to intramammary infection. Numerous therapeutic, prophylactic аnd management techniques аrе uѕеd аѕ control and reduce the mastitis. However, а widely proposed strategy marker assisted selection uѕіng candidate gene approach which іѕ based оn improving thе host genetics. One of them is cluster of differentiation 4 ( CD4 ) gene, which is а glycoprotein located оn receptors оf immune cells. CD4 exhibit аn essential role іn a variety of inflammation related conditions іn mаnу species. Therefore, CD4 as a candidate gene for resistance to mastitis has received considerable attention. The review is based on a study of CD4 in association with improving resistance to mastitis and it may be helpful in formulating breeding programmes and marker assisted selection to lower the mastitis.

Vitamin D plays a vital role in health; therefore, there is a need for a sensitive, selective, quick, and easy technique for its determination. Previous research has proposed electrochemical biosensors based on different carbon materials that are functionalized with various electrochemical biosensors. However, the existing problems and future opportunities for these sensors need further research. The practical use of electrochemical biosensors for vitamin D detection is attributed to their ability to detect vitamin D from diverse samples, including vitamin D production, in nature. This chapter provides recent investigations on the utilization of electrochemical biosensors for vitamin D detection such as Ab-25OHD/SPE/FMTAD, CYP27B1/GCE, SiO2/GO/Ni(OH)2/GCE, BSA/Ab-VD2/CD-CH/ITO, BSA/Anti VD/Fe3O4 PANnFs/ITO, BSA/Ab-VD/Asp-Gd2O3NRs/ITO, 25OHD, 25OHD Antibody, IoT-Enabled Enzyme Embossed Biosensor, Au-Pt NPs/APTES/FTO, and GCN-β-CD/Au nanocomposite. The chapter aims to provide a comprehensive overview of the recent developments in electrochemical biosensors for accurate and efficient vitamin D detection.

The pneumonia is a significant public health issue because it raises the mortality and morbidity in people of all ages (2.56 million deaths worldwide each year) and has high medical and financial expenses. The two types of pneumonia i.e. community-acquired pneumonia (CAP) and hospital-acquired pneumonia (HAP). The incidences of multi-drug resistance in gram negative bacteria create difficulty in treatment and have negative effect on patients’ results. Antimicrobial resistance has also increased with passage of time. The goal of the current study was to describe microbial pneumonia with a focus on the pathogens’ etiology, pathogenicity, epidemiology, resistance pathways, diagnosis updates, and vaccine issues in order to address the issue before it has serious consequences. When choosing an antibiotic medication, clinicians face a significant challenge due to the emergence of novel illnesses, the increase in bacteria with multiple medication resistance, and germs that are challenging to cure. It is demonstrated that the effectiveness of first antimicrobial treatment is a critical issue for mortality in pneumonia, it is imperative to manage and effectively guide adequate antibiotic treatment. This requires the knowledge of engagement of the numerous pathogens in etiology of pneumonia. Additionally, until microbiological data are known and prompt de-escalation cannot be conducted; broad-spectrum antibiotic therapy may occasionally be administered. An overview of the epidemiology, resistance trends, microbiological etiology, and microbial diagnostics of pneumonia is given in this review.

Background: COVID-19 vaccines are found to be effective interventions to tackle COVID-19. However, the hesitancy towards its acceptance has been rising in Pakistan. This study highlights the opinion of the general population in Pakistan regarding the acceptance and hesitancy of COVID-19 vaccination. Methods: A descriptive cross-sectional survey study was conducted among Pakistanis from December 2021 to January 2022. Adult respondents that have and have not received COVID-19 vaccinations were included in this study. Data collection was obtained through questionnaires that assessed acceptance and hesitancy toward COVID-19 vaccines. Statistical analysis was performed using IBM SPSS software version 25 for Windows. Results: We obtained 367 respondents with 333 respondents completing the questionnaire. There were 259 respondents who have been vaccinated. A total of 67.9% of responses agreed that vaccines could control the COVID-19 pandemic. The reasons for not getting vaccination were afraid of adverse effects (48.6%) and COVID-19 vaccines not being tested thoroughly (30.9%). The main reason for vaccine acceptance was awareness about vaccines (23.1%), a belief that vaccines can stop severe COVID-19 disease (16.8%), and self-protection (14.7%). Conclusion: Most Pakistanis agreed that vaccines could manage the pandemic. Vaccine acceptance was contributed by the awareness and belief regarding the protective effects of vaccines while vaccine hesitancy was due to the public’s doubt about the vaccines’ side effects and testing. The Pakistan government should focus on emphasizing knowledge about vaccines, educating the vaccines’ adverse effects, and utilizing social media in doing so.

| Vitamin D play a vital role in health, therefore, it is necessary to find a sensitive, selective as well as quick and easy technique for its determination. This review focuses on the Vitamin D investigations of electrochemical biosensors that have been conducted in recent years. According to the research, the practical use of electrochemical biosensors is attributed to the existence of UV radiation and transactivation of pharmaceutical items, food, or even human blood plasma in the detection of Vitamin D from diverse samples, including Vitamin D production in nature. Among the most commonly used electrochemical biosensors for vitamin D detection are Ab-25OHD/SPE/ FMTAD, CYP27B1/GCE, SiO2/GO/Ni(OH)2/GCE, BSA/Ab-VD2/CD-CH/ITO, BSA/Anti VD/Fe3O4 PANnFs/ITO, BSA/Ab-VD/Asp-Gd2O3NRs/ITO, 25OHD Antibody, 25OHD, 25OHD Antibody, IoT Enabled Enzyme Embossed Biosensor, Au-Pt NPs/APTES/FTO and GCN- β -CD/Au nanocomposite. The proposed electrochemical biosensors utilized in the previous publications studied were based on glassy carbon, carbon dots, or carbon paste, functionalized with the various electrochemical biosensors. Further research should be conducted on existing problems and future opportunities of the present electrochemical sensors for the determination of vitamin D.