Promising research at the Roslin Institute has demonstrated a needle-free, solid-dose vaccine can protect pigs against PRRS; the first time that needle-free, solid-dose vaccine technology has been shown to work in any species.
Source: PORK, December 11, 2025. Link. The development of needle-free vaccination could lower the risk of spreading diseases via reused needles, improve animal welfare and potentially address needle-phobia in people.