a group of brown circles sitting on top of a blue surface

This 1975, digitally colorized transmission electron microscopic (TEM) image, depicted four avian infectious bronchitis virus (IBV) virions, which are Coronaviridae family members. IBV is a highly contagious pathogen, which infects poultry of all ages, affecting a number of organ systems, including the respiratory and urogenital organs. IBV possesses a helical genome, composed of non-segmented, positive-sense single-stranded RNA ((+) ssRNA). This is an enveloped virus, which means that its outermost covering is derived from the host cell membrane. The coronavirus derives its name from the fact