Alshimaa Hassan is a distinguished pediatrician and public health expert specializing in infectious diseases and maternal and child health. She holds advanced degrees from Alexandria University and the London School of Hygiene & Tropical Medicine. With extensive experience in clinical practice, research, and education, Dr. Hassan has made significant contributions to public health, particularly in the areas of infectious diseases and child health. She has published influential studies on topics such as COVID-19 vaccination effects and congenital hearing loss screening.Dr. Hassan has played key roles in hospital accreditation and health initiatives, and she is a dedicated educator, conducting numerous courses and workshops on breastfeeding, safe motherhood, and child health. Her commitment to community development is evident through her involvement with the Al-Rawan Charity NGO. In "Unveiling the Microbial World: A Deep Dive into Gram-Negative Bacteria," Dr. Hassan shares her extensive knowledge and passion for microbiology, making the eBook an essential resource for learners and professionals.