Robert F. Kennedy Jr., US Secretary of Health, believes that his spasmodic dysphonia may be caused by the flu shot[1]. Kennedy stated that he received an annual flu shot until the mid-1990s, then stopped[1]. Spasmodic dysphonia is a neurological disorder in which the vocal cords involuntarily tighten and spasm, causing a hoarse voice[1]. According to Kennedy's own explanation, his vocal cords are very strong, but neurological signals constantly tell them to tighten, making his voice hoarse[1]. A common treatment for this disorder is injections of botulinum toxin (Botox) directly into the affected muscles of the larynx, which help relieve spasms and improve voice quality[1]. These injections are usually needed regularly to maintain the desired effect[1].