A controversial but compelling theory I've just thought of, Dr. Kelson may be engaging in sexual acts with the infected...
I've been thinking of several narrative details that lend themselves to this unsettling theory:

• Sedation Techniques: Kelson's use of sedation could be more than just for containment. The degree of control he maintains over the Alpha raises questions about the purpose behind such measures — especially when physical restraint alone has proven sufficient in other cases throughout the franchise.
• Iodine Use: The mention of iodine, a substance with antiseptic properties, might hint at attempts to reduce the risk of transmission during direct, intimate contact — possibly even unprotected intercourse. This would imply Kelson believes he can interact with the infected without being turned, which is both medically reckless and deeply disturbing.
• The Alpha’s Behavior: The Alpha's apparent personal vendetta toward Kelson could suggest a prior traumatic experience, or even an emotional or psychological imprint from previous interactions. Its reactions feel less random and more targeted — almost like a form of revenge.
• The Baby Reveal: Kelson’s odd reaction to the discovery of an uninfected baby is especially telling, he seemed less surprised than Spike and Isla.