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Cramer's lightning round: Be careful with this strengthening group of stocks

Elizabeth Gurdus
CNBC. Jim Cramer zoomed through his take on callers' favorite stocks, including a pharmaceutical name spooking investors.

It's that time again! Jim Cramer rang the lightning round bell, which means he gave his take on callers' favorite stocks at rapid speed:

Under Armour (NYSE: UAA): "Stay interested, but don't pull the trigger. I prefer, actually, Nike (NYSE: NKE) to that one and PVH. Now, all those stocks have run, so we've got to be careful."

Weight Watchers International (NYSE: WTW): "I think Weight Watchers is a bit of a short squeeze after this run and I don't think you should pull the trigger."

IAC/InterActive Corp. (NASDAQ: IAC): "We don't back trucks up after we've had a run to 22,000 and we've got ICBM's pointed at us. What we do is we pick gingerly. I think InterActive had a terrific quarter and I do think you should buy it, but not all at once. Not with this market, not with these little press conferences and not with the fire and the fury."

TripAdvisor (NASDAQ: TRIP): "That was not a good quarter. No. That was not a good quarter. I mean, Expedia had a good quarter. You might want to do that one, but let it come down. But that was not a good quarter for TripAdvisor."

Stericycle (NASDAQ: SRCL): "You know what? It's actually had a couple good quarters in a row. I'm tempted. I'm tempted, but I still think that the business model… people felt that last quarter wasn't as good as I did, so let's hold off for now."

Trivago (NASDAQ: TRVG): "Right now, this whole travel business is under the cloud of Priceline (NASDAQ: PCLN). We're going to have to hold off on Trivago. Priceline, as I said, I did not defend that this time. I think this group is pausing."

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