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In the wilderness yesterday I ran out of water and did not think I could hike out safely at my level of hydration. Lacking a treatment method, I drank 1.5 liters of water directly out of a small, swampy creek.
I understand that the risk of getting sick really comes down to chance, and that it might be weeks before any illness manifests itself. Being back in civilization, is there anything I can do now to ward off a potential symptomatic infection?
This is nothing to worry about. Visiting the doctor won't accomplish anything if you don't have any symptoms of illness.
In the case of giardia, which is the organism that is the biggest worry in popular perception, there's about a 25% chance that you already had it in your gut and were just asymptomatic. People often acquire it when changing diapers. Wilderness-acquired cases are extremely rare, and there is little definitive documentation that they even occur at all. It has a long incubation period, and even if you did have a wilderness-acquired case, there would probably not be enough of it to detect in a stool sample at this early date. It resolves itself and does not require treatment except possibly for symptoms (immodium).
There are other disease-causing organisms besides giardia that you could have conceivably picked up, but speculating about all the hypotheticals is pointless if you don't have any symptoms.
The best thing you can do to both ward off illness, and catch any illness so it can be treated early, is to schedule an appointment with your doctor, soon. When you request the appointment, make sure you mention drinking untreated creek water as the reason for the appointment. That will give your doctor time to look up references to the appropriate information they will need to advise you. Follow their advice.
Prior to seeing your doctor, practice good self care. Get your regular 8 hours of sleep a night, stay well hydrated, eat a reasonably balanced diet, get a little bit of exercise every day, and stay sober. Basically, do the things you would do to try to stay healthy if you thought you might have a cold coming on right before a big vacation and you really don't want to get sick and have to cancel.
Also, practice good hand-washing hygiene, especially around using the bathroom and preparing food for others. Some water-borne illnesses such as cholera are caused by exposure to waste in the water (either human or animal), and can be spread by preparing food with poorly washed hands. Again, it's nothing very special, just being diligent about actually doing the good habits that we all know we should do but sometimes get lazy about.
For what it's worth, I had a previously scheduled appointment with my primary-care physician a few days after the incident. One of his interests/specialties is remote and wilderness medicine.
His advice was that in the absence of symptoms there is nothing to do but wait. There is no way to preempt symptomatic infection after exposure, but if symptoms develop they should be reported as soon as possible for treatment.
I am a retired university professor in Public Health, especially in simple remedies. My Korean wife and I have traveled into 30 countries giving seminars. The one friend of travelers is charcoal, either powder or tablets. It is one of the best stomach remedies to protect from water or food in foreign situations. A couple of cards of Activated Charcoal carried in the pocket or backpack are very useful in any situation with suspect food or water. A couple tablespoons of Charcoal Powder in warm water or 8 tablets with a glass of warm water are a good remedy or preventive. If you are infected, then you might have to repeat it 2-3 times in a day.
Of course sometimes you contact something really bad and you have to get to the hospital or MD. Iodine drops can be useful, too, but you can develop an iodine sensitivity if overdoing the drops. Charcoal never does anything but help you, except in one way - It can adsorb some of your vitamins and, if you don't have enough fiber in your diet = constipation. Like a rock!
Many years ago, I was in a similar situation. When I returned to civilization I went to see a medical doctor.
If I recall correctly, the doctor ordered one or two tests in which I was required to collect a small amount of my stool and place it in a cup for analysis. My memory of the experience has faded, but I think the cup was filled with some sort of liquid to help preserve the stool sample. There might have also been a test that had me smear a tiny amount of stool onto a card for lab analysis.
The doctor also had some blood (serum) tests performed at a lab to establish a baseline for my health. The doctor then performed the same tests several weeks later to see if anything had changed.
As a courtesy to others, I did not share food/drinks/kisses with anyone until we had determined that my health was not affected by drinking the non-potable water.
After that experience, I have always packed extra water, and when appropriate, a water filter.
At the time, yes.
Don't eat anything when you drink the water.
This will reduce the likelihood and severity of food poisoning.
The ingested water will have its pH rapidly reduced which will kill some pathogens. if you have food in the stomach as well this will happen more slowly. Also, a bolus of food is more likely to protect and transport pathogens. Particularly don't eat fatty/oily foods.
I did spend time looking up my microbiology books, but cannot find an exact ref. I was taught this in one of my four microbiology subjects.
