latent, dormant, quiescent, potential mean not now showing signs of activity or existence. latent applies to a power or quality that has not yet come forth but may emerge and develop. dormant suggests the inactivity of something (as a feeling or power) as though sleeping.
However, H1N1 can progress quickly, so it is uncertain if knowing the patient had influenza would have prevented their rapid progression. Vasopressors can cause tissue ischemia if used in high doses, and I have seen necrosis of digits due to vasopressors. That being said, I have never seen limb amputations due to vasopressor use, but it could happen.
If breast cancer cells have progesterone receptors, the cancer is called PR-positive breast cancer. If the cells do not have either of these two receptors, the cancer is called ER/PR-negative. About two-thirds of breast cancers are ER and/or PR positive.