once

"Another case

inflicted the helpless locals with our highly evolved strains of influenza." His thick lips twisted in a wry smile. "Of course, I'm sure they'll be getting their revenge soon enough, once smallpox hits us. Which it will, don't think it won't."
"Any luck with—"
James shrugged. "Jeff Adams thinks we'll have a vaccine ready to go within a month or so, in large enough quantities to make a difference. I just hope he's right that using cowpox will work. Me, I'm a little skeptical. But . . ."
Suddenly, he grinned. The expression came more naturally to James Nichols' face than did the scowl which usually graced it these days. "You'd think, wouldn't you, that a boy from the ghetto would be less fastidious than you white folks! But, I ain't. God, Mike, talk about the irony of life. I can remember the days when I used to complain, back in my ghetto clinic, that I was mired in the Dark Ages. And here I am—mired in the real Dark Ages."
"Don't ever let Melissa hear you say that," responded Mike, grinning himself. "Talk about a tirade!"
James sniffed. "Fine for her to lecture everybody on the upstanding qualities of people in all times and places. She was brought up a Boston Brahmin. Probably got fed political correctness with her formula. Me, I grew up in the streets of south Chicago, and I know the truth. Some people are just plain rotten, and most people are lazy. Careless, anyway."
He heaved himself erect from his weary sprawl in the chair, and leaned over the desk, supporting his weight on his arms. "Mike, I'm really not a monomaniac. You just don't have any idea what disease can do to us—the whole damn continent—living h