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Can you clarify the differences between Tier 1 and Tier 2 as described in the Basketball Guidelines? Are there other tiers?
A recently published article in the British Journal of Sports Medicine provides the following explanation of the use of these references:

Tier 1: This is the highest exposure tier and consists of individuals for whom physical distancing and face coverings are not possible or effective during athletic training or competition. Examples of relevant individuals include student-athletes, coaches, athletic trainers and physical therapists, medical staff, equipment staff and officials.

Tier 2: This is a moderate exposure tier and consists of individuals who come into close contact with Tier 1 individuals but can reasonably maintain physical distance and use face coverings. Examples of relevant individuals include certain team staff (e.g., executives) and certain operational staff (e.g., security, event staff and league staff).

Tier 3: This is the lowest exposure tier and includes individuals who provide event services but do not come into close contact with Tier 1 individuals (and should this occur, would be reclassified into Tier 2). Examples of relevant individuals include certain operational staff (e.g., housekeeping, catering, sanitation and transportation) and media/broadcast.