I received an e-mail from my group, and Reverend Satyabhama recommended the following in her message:
a = uh aa = a, not ah
Om Try'ambakam Yajaa Mahae Sughandim Pushti Vardhanam; Uvaaru'kamiva Bandha'naan, Mrityor Muksheeya Mamritat (Transliteration by Sadguru Sant Keshavadas.)
Pranayama is good to both avoid getting sick and to keep breathing well, if we catch it.
For illness, put some water in a cup and chant, Oushadam Jahnavee Toyam Vaidyo Narayano Harihi. The holy water touched by God is the best remedy, and Heavenly Father, Narayana, is the best physician.
Be sure to get plenty of sunshine outside or in a sunny window. Chant this Surya Gayatri Mantra, Om Bhaaskaraa'ya Vidhmahae Diwa Karaa'ya Dheemahi Tanno Surya'ha Prachoda''yaat to invoke the sun's energy.
For strengthening the breath and healing the lungs:
1. Om Ashwinaa Tejasaa Chakshuhu Praanaena Saraswati Veeryam Vachendro Balendraaya Dadhur'.indriyam
2. Om Ashwinaa Bhaeshajam Madhu Bhaeshajam Naha Saraswati Indro Twashtaa Yasha'ha Shreeya'ha Rusha'ha Rupa Madhu'hu Sutae
EDIT: Because it seems some people are confusing these as a solution for the coronavirus, let me make this clear: do not use these in place of going to an actual physician. These are supplementary meditative practices for karmic work, and healing does not mean you will be healed of the coronavirus, healing can mean alleviating the karma that would be the difference between falling down the stairs or stubbing your toe.