Alpha-gal syndrome (AGS) is an emerging tick-borne allergic condition associated with bites from the lone star tick (Amblyomma americanum). Unlike typical tick-borne diseases caused by bacteria or viruses, in AGS there is a delayed allergic reaction to galactose-α-1,3-galactose, a sugar referred to as alpha-gal, which is present in tick saliva; most mammalian meat, such as beef, pork, and lamb; animal-derived products, such as gelatin and dairy (including cow's milk); and certain medications containing animal products. AGS was first identified in the early part of this century, with a notable rise in reported cases in recent years. Contributing factors include climate change, altered wildlife migration, and other ecological shifts that have allowed the lone star tick to expand its range north and west across the United States. Clinically, AGS is characterized by an atypical, delayed allergic response that can occur hours after consumption of red meat. Sensitivity to alpha-gal is delayed for weeks to months after the tick bite, and the allergic reaction after ingesting something that contains the antigen is delayed by hours. Gastrointestinal manifestations are common, and patients may also develop urticaria, bronchospasm, or potentially life-threatening anaphylaxis. The condition is underdiagnosed, owing to its unusual presentation and limited awareness among clinicians. With the continued expansion of the lone star tick's habitat, the incidence of AGS is expected to rise. Enhanced awareness, targeted research, and improved education for both health care practitioners and the public are crucial to reducing misdiagnosis and improving management. Strengthening public health initiatives will be key in addressing this complex and evolving allergic condition. This article aims to describe the epidemiology; pathophysiology, including the role of A. americanum in transmission; and clinical presentation of AGS and highlight its link to tick bites; common barriers to accurate diagnosis; and current strategies for prevention.
Vitko et al. (Thu,) studied this question.