There was scandal last year when Fr. Richard Boyle (prior, Syracuse) published the following Mater Dei Academy Handbook, which included this official policy regarding the SSPX's submission to communist state requirements:
"Vaccinations In New York, state law requires that children enrolled in a school be immunized against certain diseases. Parents must therefore submit a pupil immunization record upon enrollment, and provide updates as required. If you do not immunize your child(ren) or if you have refused any of the New York State required immunizations, enrollment will not be permitted. Any further detail on the vaccinations required by New York State is available from the school main office upon request. SSPX Statement on Vaccination Schools of the US District of the Society of Saint Pius X comply with vaccination policies of local health and education authorities while adhering to moral principles of the Roman Catholic Church. The Catholic Church does not oppose vaccinations in principle, but it does consider as morally illicit the development of vaccines from aborted fetal tissues. In
2005, the
[heretical modernist] Vatican clarified the proper position of all Catholics on this matter, and
the SSPX adheres to that declaration. Schools of the SSPX also support parental authority and freedom of choice, in matters not opposed to the moral law. If the state law does not mandate vaccination, neither do our schools. In the event of an outbreak of an infectious disease, our schools work closely with local and state officials to respond according to the guidelines prescribed by the governing authorities.1"
https://syracuse-a.prod.sspx.org/sites/sspx/files/media/mater_dei_parent_student_handbook_sept_25.pdfA reported 50% of parents pulled their children from the school, rather than endanger them (or consent to the at-least questionable moral ruling of the modernist Vatican declaration, which bases itself upon condemned proportionalism to arrive at its conclusion regarding the liceity of receiving vaccines derived from aborted fetal matter).
Fr. Boyle was rewarded by being placed in charge of all SSPX schools.
Consequently, and in light of the excerpt above detailing the SSPX rationale for complying with New York state law, it is entirely reasonable to expect similar policies to be implemented in all SSPX schools. Moreover, with the COVID19 hoax designed (among other reasons) to create a climate for justifying mandatory vaccination, it is likely policies similar to those in New York will eventually spread everywhere.
This means it is very likely that SSPX parents will now/eventually be coaxed by their SSPX priests into endanger their children by poisoning them in turn for a school education (in addition to having to wrestle with the questionable moral justification given by the modernist Vatican for doing so).
Masks, quarantines, social distancing, vaccinations, church closures, etc.
The SSPX seems to be going along with it all, just as their Americanist predecessors did so 125 years earlier.
PS: As of 12/2019, non-abortive MMR vaccines were no longer available in America, so even if you were willing to destroy your child's immune system, and incur a 54% change of developing a chronic illness, you would still have to wrestle with the moral issue...unless you take solace in the 2005 Vatican paper (released just a couple months after the death of JPII, who condemned the very proportionalism which comprises the justification of that docuмent).