These days, the background music of my life is a chorus of coughing and sneezing. At work, colleagues complain of scratchy throats and put illness emoji next to their names on Slack. At home, my daughter returns from day care with a backpack full of construction paper crafts and, more often than not, a runny nose. No matter how much my husband and I wash our hands — and hers — the germs inevitably get passed on to our baby, and then to us. Sometimes it seems like there’s barely a break before an