Table 1.

Annotation guideline summary. ∗ indicates the argument is required. ^† indicates at least one of the arguments, Test Status or Assertion, is required.

Event type,e	Argument type,a	Argument subtypes,$L_l$	Span examples
COVID	Trigger∗	–	“COVID,” “COVID-19”
	Test Status†	{positive, negative, pending, conditional, not ordered, not patient, indeterminate}	“tested positive”
Assertion†	{present, absent, possible, hypothetical, not patient}	“positive,” “low suspicion”
Symptom	Trigger∗	–	“cough,” “shortness of breath”
	Assertion∗	{present, absent, possible, conditional, hypothetical, not patient}	“admits,” “denies”
	Change	{no change, worsened, improved, resolved}	“improved,” “continues”
	Severity	{mild, moderate, severe}	“mild,” “required ventilation”
	Anatomy	–	“chest wall,” “lower back”
Characteristics	–	“wet productive,” “diffuse”
Duration	–	“for two days,” “1 week”
Frequency	–	“occasional,” “chronic”