This book is the perfect introduction to COVID-19 in Iraq. The transmission of COVID-19 and herd immunity in Iraq covers the epidemiological curve of the cumulative confirmed cases of COVID-19 in Iraq. Details of human coronaviruses that have been linked to the possibility of infection in the nervous system have been clarified, the transmission of COVID-19 is expected under the influence of air temperature and relative humidity throughout the year, in Baghdad, Iraq, and preparedness in Iraq, against the spread of the COVID-19 pandemic: herd Immunity.