“Death cross” patterns continue to spread through the stock market like an epidemic, even infecting market segments believed to be more insulated from overseas turmoil.

The Russell 2000 index RUT, +0.78% of small-capitalization stocks became the latest victim among the major market indexes. The index’s 50-day moving average fell to 1,222.95 in midday trade Tuesday, crossing below the 200-day moving average (MA), which slipped to 1,224.11, according to FactSet.

Small-cap stocks can’t hide from the ‘death cross’ virus

Many chart watchers believe a death cross, when the 50-day MA crosses below the 200-day MA, indicates that a shorter-term decline has developed into a longer-term downtrend.

The Russell 2000’s last death cross appeared on Sept. 22, 2014. The index fell another 7.1% in the three weeks after that before bottoming at a one-year low.

That follows the death cross that appeared in the S&P MidCap 400 Index MID, +1.01% on Monday.

Midcap stocks tracker infected with death cross on Monday

Smaller-cap companies tend to have less exposure to international markets than larger-cap companies, so are believed to be more insulated from weakness in overseas markets. For example, the Russell 2000 component with the largest market cap, Anacor Pharmaceuticals US:ANAC, gets 100% of its revenue from the U.S., according to FactSet, while the S&P 500’s largest company, Apple Inc. AAPL, +1.57% , gets about 62% of its revenue from overseas.

Since the meltdown in China’s economy and stock market helped spark the volatility in U.S. markets in the last few weeks, the Russell 2000 has outperformed the broader market.

Among the large-cap trackers, the S&P 500 index SPX, +1.05% produced a death cross last Friday, while one appeared in the Dow Jones Industrial Average’s DJIA, +0.51% chart back on Aug. 11.

S&P 500 produces first death cross in 4 years

Apple Inc.’s chart AAPL, +1.57% produced a death cross on Aug. 26.

Many have questioned whether a well-telegraphed moving average crossover is really a bearish signal or not. But at the end of 2008, three months before the market bottomed, all 30 Dow stocks had produced death crosses.

Among other notable indexes in which the bearish pattern has appeared, the Dow Jones Total Stock Market Index DWCF, +0.98% also produced a death cross on Tuesday, the Dow Jones Transportation Average DJT, +0.76% produced one on May 26 and the Dow Jones Utility Average DJU, +0.71% produced one on May 7.

Nasdaq Composite still safe, for 2-3 weeks