• (Most likely IMO) A grocery trip on Oct 10th in a P100. Lingered in aisles extra long unable to find stuff, trying not to narrowly follow where coughing kids/adults had been, which were numerous. Thing is, I wore a P100 and airtight eye protection. I was as sure as ever of the seal of both, and this STILL is the most likely route -- a stealth P100 leak. I even sprayed nose + throat with strong neutral HOCl when I got home to kill anything that got past before it could replicate, and this is STILL the most likely vector.
  
  
• On the same trip on the 10th, unmasking in a huge empty field with over ~100ft social distancing to other hikers, open visibility in all directions. Dry sunny air. If there was someone heading upwind I donned. I biked to get there in a P100.
  
  
• On Oct 7th I had a fleeting interaction talking over a fence at a person who had a cough when we were apart. Outside in a P100.
  
  
• Feeding feral cats outside in a P100. Besides the two dates above, cats were my only exception from isolation. Several days ago, one of them barged inside for a moment and sneezed at me to feed them faster, into my house air. I cranked up the corsi box and made the front room a wind tunnel, avoided it, and kept the p100 on several extra minutes.
  
  
• Apartment air leakage. Mine is a single floor house, sharing only one wall with a neighbor, along the kitchen and bathroom. It would have to be a very slow seepage. I count it as more possible because I could hear someone sneezing as they went in and out this week one day. That was by my outside double door which seals pretty well, and I cranked up the huge corsi by the door on high for the rest of the day.
  
  
• A possibility involving very long incubation times. On Oct 1st I had a quick chat outside with a neighbor in a P100. Sept 29th was my previous major trip out, similar to my grocery trip on the 10th, no worse. The 28th, chilling with neighbor outside in a P100. I've accounted for every exposure going back to Sept 25th.
  
  
• Some freak occurrence like an undetected sewage gas bubble, a secret bio attack, food that stayed infectious for several days in the fridge, etc.
  

• Like everyone else, I don't protect my ears from exposure. I've had my ears checked at doctors and they've never noted a perforation or anything. Usually on the rare days before I wake up tonsillitis on one side, I'll get ear canal pain on that side. It happened again this time as my first symptom. Could it be...? Nah, right?
  
• I have a window A/C unit. It's the cheap kind with styrofoam internal seals, and certainly is not airtight. It's practically pressed up against the fence neighbors' fence (more of a tall solid wall) by just several inches. The sound of people working on the other side of this wall transmits through loudly, making it sound quite close. But again, we're talking about outdoor to indoor transmission, through slow seepage; it seems like the total volume of air would be very diluted on average.
  
• Fomite transmission from a new CPAP unit I got in the mail and tried the same night starting on the 3rd. I flooded every piece the thing with HOCl to disinfect and then soap water and then dried before assembling, and used bottled water in the humidifier of it, which is all that should have been left to aerosolize.
  

maxwellhill has issued a correction as of 05:26 on Oct 19, 2023