Each night a couple years ago, Louis Salgado fell asleep    knowing he would wake up a few hours later itching all over his    body.  
    The West Covina apartment he and his late wife shared for two    decades was infested with bed bugs for the better part of 2015.  
    I couldnt sleep, Salgado, 64, said recently as he recalled    the most uncomfortable experience of his life. It got to the    point that Id be up in the middle of the night with a    flashlight and Id be seeing them crawl all over the carpet and    Id try to kill them, try to stomp on them tried whatever I had    available.  
    Turns out bed bugs, those not-so-cuddly insects our parents    mentioned when they tucked us in at night  and that we didnt    give a second thought to, are very real these days.  
    And, yes, they bite.  
    Indeed, experts say the reddish-brown bed bug that is about the    size of a grain of rice has made an extraordinary comeback    after a roller coaster of a century.  
    In the early decades of the 1900s, the bug was widespread    across the U.S. But the advent of DDT during World War II    changed that, killing off huge numbers in the 1940s and 50s.  
    We thought it was gone forever, said Dini Miller, professor    of entomology at Virginia Tech University. When you think    about it now, that was kind of stupid.  
    After lying low for decades, the dreaded insect that was    mentioned in medieval European literature is enjoying a    renaissance of sorts. Since 2000 its numbers have multiplied.  
    Its just exploded, Miller said.  
    Today theyre everywhere.  
    According to the U.S. Centers for Disease Control and    Prevention, theyre in apartments, houses, shelters, college    dormitories, cruise ships, buses and trains. They typically    live within an 8-foot crawl of where people sleep.  
    And if you thought your car was a refuge from the blood-sucking    pests, guess again. Miller said bed bugs are fond of    automobiles  for good reason.  
    The food comes and sits down on a regular basis, she said.    And everybody gets something to eat.  
    The crazy thing is, you dont know when your blood is being    slurped through the bed bugs version of a straw  an elongated    beak  for a meal. The CDC says the bug injects an anesthetic    and anticoagulant that renders its bite painless.  
    Itchy, bite marks do appear in a few days. They are similar to    marks from a mosquito or flea bite, a slightly swollen and red    area, the CDC said.  
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    Scratching sometimes causes infection. But many people have no    reaction at all.  
    In any event, bed bugs arent considered dangerous.  
    They do not transmit any diseases, said Dong-Hwan Choe, an    urban entomologist and assistant professor of entomology at UC    Riverside.  
    Choe is working to develop a device that can detect bed bugs    for hotel chains and other businesses.  
    It has to be simple. It has to be cheap, Choe said. It has    to be small so that it can be placed without being noticed by    the people staying in the hotel.  
    Disease bearing or not, the thought of being dined on is enough    to make ones skin crawl.  
    Choe said the bugs feed mostly at nighttime, which creeps    people out.  
    And dont think you can fool them if you work a graveyard shift    and sleep during the day.  
    In a 2015 article titled, Your Guide to Bed Bugs, University    of Kentucky entomologist Michael Potter said the pest will    adjust its schedule to yours.  
    Sleeping with the lights on is also not likely to deter hungry    bed bugs, Potter wrote.  
    Potter said a feeding takes three to 10 minutes. Then the bug    crawls back into its hiding place to digest the meal. Its flat    body enables it to hide in tiny crevices in mattresses, box    springs and bed frames.  
    When it comes to the creep-out factor, there is at least one    thing in our favor: unlike other insects, bed bugs cant fly,    Choe said.  
    But theyre speedy. The CDC says the bugs can crawl more than    100 feet in a night.  
    The nations big bad bed bug blow-up can be traced to a number    of factors, experts say.  
    For one, DDT is long gone. The EPA banned it in 1972.  
    Even so, the bugs were building up resistance to DDT, Miller    said. And, gradually, they are building up a defense against    insecticides being used today.  
    She said some have developed thick, protective skins.  
    Others produce enzymes that break down toxic ingredients and    render insecticides harmless.  
    We like to call those the hard-drinking bugs, she said.  
    Still other bed bugs have mutated.  
    They meet, fall in love and make other genetically immune    babies, Miller said.  
    Perhaps we have ourselves to blame, too.  
    With the bugs out of sight and out of mind for decades, we have    been slow to rally against them.  
    Plus, we travel a lot these days to faraway places, experts    say. And the bugs are good at hitchhiking a ride home on our    luggage.  
    Los Angeles is the nations sixth worst metro area for bed    bugs, according to Atlanta-based Orkin. In the firms 2017    ranking, L.A. followed Baltimore, Washington, D.C., Chicago,    New York and Columbus, Ohio.  
    For the Orkin survey, the L.A. area was defined as Los Angeles,    Orange, Riverside, San Bernardino and Ventura counties.  
    Miller noted Terminix puts out an annual ranking, too. In its    most recent report, Detroit was No. 1 on the list. L.A. was No.    4.  
    You have to take all of this with a grain of salt, Miller    said. But, its one of the few indicators that we have.  
    During the fiscal year ending June 30, Los Angeles County    received nearly 1,500 bed-bug complaints  about 19.5 percent    fewer than the previous year  according to data from the Los    Angeles County Department of Public Health, which does not    track Long Beach, Pasadena or Vernon because those cities have    their own health departments.  
    Sixty-two of those complaints originated from communities    within the San Gabriel Valley, the data showed.  
    Between July 1, 2016 and June 30, 2017, the Pasadena    Environmental Health Division received 25 bed-bug complaints,    according to city data. It received 26 complaints during the    same period the previous year.  
    Not including Pasadena, residents in El Monte filed the most    bed-bug complaints  15  with the county during the year    ending June 30, according to the county data.  
    Choe, the expert from UC Riverside, said densely populated    cities such as El Monte are more prone to infestations than    sparsely populated ones.  
    They tend to have more frequent problems with bed bugs because    they have more units and more people living close together,    Choe said.  
    Some apartment units are treated repeatedly.  
    That may seem over the top. But its in line with the industry    experience.  
    Salgado, who moved to La Puente earlier this year, said his    West Covina apartment was only treated once and once was    enough.  
    They spray your mattress, we had to throw couches away,    everything was infested, he said. It was a big ordeal.  
    According to a national survey, two to three treatments is    typical when insecticide is sprayed.  
    Survey results were detailed in Bed Bugs Across America, a    2015 report by University of Kentucky entomology professors    Potter and Kenneth Haynes, and Jim Fredericks, vice president    of technical services for the National Pest Management    Association.  
    More expensive heat treatments are more likely to knock out an    infestation in one visit, the report stated.  
    Because heat treatment can take most of the day, said Glen    Ramsey, Orkin technical services manager, conventional    treatment is more common.  
    Heat treatment takes longer than conventional treatment, as    the affected areas need to be warmed up to 125 degrees, held    for one hour and then cooled back down, Ramsey said.  
    The report said treatment costs averaged $1,225 for    single-family homes and $3,128 for multifamily buildings in    2015, though some apartment managers spent as much as $50,000.  
    That places Plymouth West at the high end of the range. Davis    said LOMCO spent $400,000 for treatments there from 2013 to    2016.  
    Before an exterminator ever steps foot in the door, extensive    preparations are made.  
    Residents strip beds of sheets and blankets, empty dressers and    closets, and wash and bag clothes.  
    The key is to put them through the dryer for an hour at high    temperature, Long Beach resident Gary Shelton said.  
    Shelton had to leave his apartment for several hours. He    returned the same day. Other renters spent a night in a motel.  
    Underscoring the difficulty involved in eradicating bed bugs,    Sheltons unit was sprayed three times. Even then exterminators    didnt get everything.  
    They said they couldnt get the bed bugs out of the bed    frame, Shelton said.  
    So he threw it out and bought a new one.  
    Life is getting back to normal now. Its been anything but    since that fateful day in late November.  
    A friend was over and noticed a live bug in the middle of the    bed spread, Shelton said.  
    He was stunned. I wasnt getting bites that I was aware of,    he said. But he promptly called the apartment manager.  
    After seeing one, he started seeing a lot more bugs.  
    Once you see them, youll see them in your mind, Shelton    said. Youll see them everywhere.  
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    BEDBUG (NOT SO FUN) FACTS  
     Size: 1 mm to 7 mm, roughly the size of    Lincolns head on a penny  
     Color: Reddish brown, similar in coloration    to an apple seed  
     Food: Human blood  
     Home: Within 8 feet of sleeping quarters.    Known to live in apartments, houses, hotels, shelters, cruise    ships, buses, trains and dormitories  
     Travel: Cant fly or jump, but can crawl    fast  up to 100 feet per day  
     Bite: Similar to mosquito, flea bites; does    not carry disease  
     Evidence of presence: Bedbugs in folds of    mattresses and sheets, rusty-colored blood spots; a sweet,    musty odor  
     Treatment: insecticide, heat; significant    preparation required of home occupants in advance; professional    treatment recommended  
     No-nos: Do not spray bed sheets, blankets or    clothes; do not apply bleach or alcohol. Applications of    rubbing alcohol have sparked fires.  
    Sources: U.S. Centers for Disease Control and    Prevention; Your Guide to Bed Bugs, by Michael Potter; news    reports  
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Bed bugs make unwelcome return to Southern California - The San Gabriel Valley Tribune