These recommendations take into account considerations for the efficacy and longevity of each specific vaccine; the exposure, risk, and need of different cat populations; and socioeconomic limitations.Recommendations vary for:

animal shelters
boarding facilities (or animals going into them)
breeders
community cats (free-roaming and/or feral) or TNR (Trap Neuter Return) programs
owned pets (and based on "inside only" or "in and out")The FPLV vaccination is considered a "core" (essential for health) vaccine and is recommended for all domestic cats. Even cats kept indoors can be infected from fomite transmission.Several types and brands of commercial FPLV vaccines are available to induce acquired immunity. These include: 

killed virus ("non-infectious") adjuvanted
killed virus non adjuvanted
modified-live virus (MLV or "infectious") adjuvanted
modified-live virus non adjuvantedCombination vaccines that protect against several common viruses, including FPLV, are also available. Selection or use of a specific type/brand of a vaccine may vary depending on the overall risk of viral infection to the specific animal in its environment, along with considerations for the time it takes to confer protection, its overall efficacy, the animals health, and the potential risks associated with MLV vs killed, adjuvanted vs nonadjuvanted, intranasal/ocular vs injection. Modified-live FPLV vaccines are not recommended in pregnant queens, very young kittens, or cats with FIV or FeLV.Kittens without maternally derived antibodies are especially vulnerable. FPLV vaccination can start as early as 4 weeks of age for kittens at high risk but are usually started at 6 weeks, then given every 3 – 4 weeks until 16 weeks of age.
A cholinergic crisis is an over-stimulation at a neuromuscular junction due to an excess of acetylcholine (ACh), as a result of the inactivity of the AChE enzyme, which normally breaks down acetylcholine. Symptoms and diagnosis
As a result of cholinergic crisis, the muscles stop responding to the high synaptic levels of ACh, leading to flaccid paralysis, respiratory failure, and other signs and symptoms reminiscent of organophosphate poisoning. Other symptoms include increased sweating, salivation, bronchial secretions along with miosis (constricted pupils). This crisis may be masked by the concomitant use of atropine along with cholinesterase inhibitor medication in order to prevent side effects. Flaccid paralysis resulting from cholinergic crisis can be distinguished from myasthenia gravis by the use of the drug edrophonium (Tensilon), as it only worsens the paralysis caused by cholinergic crisis but strengthens the muscle response in the case of myasthenia gravis. (Edrophonium is a cholinesterase inhibitor, hence increases the concentration of acetylcholine present).